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California State Polytechnic University – Pomona
1.
Murphy, Andrew.
Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell.
Degree: MS, Department of Mechanical Engineering, 2020, California State Polytechnic University – Pomona
URL: http://hdl.handle.net/10211.3/215715 
► This thesis investigates the performance of a small portable fuel cell design using a digital finite element model of the fuel cell and solving with…
(more)
▼ This thesis investigates the performance of a small portable
fuel cell design using a digital finite element model of the
fuel cell and solving with a CFD analysis program. Fluid dynamics, thermal effects, and electrochemical reactions as well as the model set up and configuration are included in this study. Two different electrolyte systems are compared (a primary electrolyte option and a secondary). The results suggest the
fuel cell is able to maintain practical power levels when operated under the proper conditions. The analysis indicates that while functional, the alternate electrolyte system produces less power than the primary electrolyte system but the results are limited by the capabilities of the analysis program and further study would be beneficial.
Advisors/Committee Members: Anderson, Kevin (advisor), Xue, Henry (committee member).
Subjects/Keywords: fuel cell
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APA (6th Edition):
Murphy, A. (2020). Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell. (Masters Thesis). California State Polytechnic University – Pomona. Retrieved from http://hdl.handle.net/10211.3/215715
Chicago Manual of Style (16th Edition):
Murphy, Andrew. “Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell.” 2020. Masters Thesis, California State Polytechnic University – Pomona. Accessed March 07, 2021.
http://hdl.handle.net/10211.3/215715.
MLA Handbook (7th Edition):
Murphy, Andrew. “Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell.” 2020. Web. 07 Mar 2021.
Vancouver:
Murphy A. Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell. [Internet] [Masters thesis]. California State Polytechnic University – Pomona; 2020. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10211.3/215715.
Council of Science Editors:
Murphy A. Numerical CFD Analysis of Compact Circular Proton-Conducting Fuel Cell. [Masters Thesis]. California State Polytechnic University – Pomona; 2020. Available from: http://hdl.handle.net/10211.3/215715
University of Guelph
2.
Crozier, Ryan.
Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications.
Degree: MS, Department of Chemistry, 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17490
► Increased awareness of climate change and problems associated with environmental pollution have led to an international search for alternative fuel sources and methods of energy…
(more)
▼ Increased awareness of climate change and problems associated with environmental pollution have led to an international search for alternative
fuel sources and methods of energy conversion. This includes innovating current transportation methods to be less reliant on fossil fuels and have reduced CO2 output. Automobiles currently rely on extremely inefficient internal combustion engines (ICEs). A popular alternative to ICE vehicles are
fuel cell vehicles, which boast efficiencies two-to-three times higher than ICEs depending on the type of
cell used and the operating temperature. This thesis is an investigation of the temperature changes at the gas-electrode interface of lanthanum strontium cobalt ferrite – gadolinium doped ceria (LSCF-GDC), a candidate material for the cathode of a solid oxide
fuel cell. The observations from experiments indicated that the changes in temperature caused by changing the load and the flow rate were minimal compared to the overall
cell temperature, and therefore their impact on
cell structure and degradation is likely minimal as well. Furthermore, the
cell, as measured from the side of the cathode, equilibrated relatively quickly, which is ideal in the application of SOFCs in mobile applications such as FCVs, where rapid changes in load demand are needed to shift the power of the vehicle.
Advisors/Committee Members: Thomas, Daniel (advisor).
Subjects/Keywords: fuel cell; solid oxide fuel cell
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APA (6th Edition):
Crozier, R. (2019). Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17490
Chicago Manual of Style (16th Edition):
Crozier, Ryan. “Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications.” 2019. Masters Thesis, University of Guelph. Accessed March 07, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17490.
MLA Handbook (7th Edition):
Crozier, Ryan. “Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications.” 2019. Web. 07 Mar 2021.
Vancouver:
Crozier R. Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications. [Internet] [Masters thesis]. University of Guelph; 2019. [cited 2021 Mar 07].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17490.
Council of Science Editors:
Crozier R. Characterization of Temperature Changes at the Gas-Electrode Interface of Lanthanum Strontium Cobalt Ferrite - Gadolinium doped Ceria based Cathodes for Solid Oxide Fuel Cells used in Mobile Applications. [Masters Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17490
Georgia Tech
3.
Fang, Zhengyuan Jung.
Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes.
Degree: PhD, Chemical and Biomolecular Engineering, 2020, Georgia Tech
URL: http://hdl.handle.net/1853/64129
► Large transport resistances at high current densities hinder the proton-exchange-membrane fuel cells from reaching performance-cost-durability targets set by the U.S. Department of Energy (DOE). In…
(more)
▼ Large transport resistances at high current densities hinder the proton-exchange-membrane
fuel cells from reaching performance-cost-durability targets set by the U.S. Department of Energy (DOE). In this dissertation, the effect of carbon corrosion on the electrode wettability and the effect of carbon surface functionalization on the
fuel cell performance and durability are investigated. In the wettability study, commercial membrane electrode assemblies were employed and the surface roughness and porosity were fitted to surface texture models. It was found that cathode sustained its wettability after up to 35 wt% of carbon support loss, at which the
cell performance dropped below the DOE’s durability-performance target. In the surface functionalization study, three schemes were investigated for either grafting positively charged nitrogen surface groups or negatively charged sulfonate groups for three types of carbon supports. In full-
cell tests, improvements over high current densities were observed in samples reacted with para-phenylenediamine or ammonia, whereas the performance decreased after functionalization with sulfonate groups. The improvement at high current densities exceeded the mass-activity improvement and was attributed to reduced mass-transfer polarizations. Furthermore, a statistical approach was explored to examine the changes in ionomer surface coverage and ionomer coverage was found to increase after functionalization with nitrogen containing group. In addition, accelerated stress tests were performed to study the durability. Lastly, a modified agglomerate model was developed to study the effect of ionomer coverage on the electrode mass-transport resistance. The major contributions of this dissertation include understanding the role of electrode wettability in durability studies, providing high-performing carbon supports that can be incorporated to the state-of-the-art electrocatalysts, and exploring a novel approach to calculate nano-scale ionomer coverage on the electrocatalysts.
Advisors/Committee Members: Fuller, Thomas F (advisor), Kohl, Paul A (committee member), Liu, Nian (committee member), Ludovice, Peter J (committee member), Alamgir, Faisal (committee member).
Subjects/Keywords: PEM fuel cell; fuel cell durability
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APA (6th Edition):
Fang, Z. J. (2020). Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/64129
Chicago Manual of Style (16th Edition):
Fang, Zhengyuan Jung. “Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes.” 2020. Doctoral Dissertation, Georgia Tech. Accessed March 07, 2021.
http://hdl.handle.net/1853/64129.
MLA Handbook (7th Edition):
Fang, Zhengyuan Jung. “Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes.” 2020. Web. 07 Mar 2021.
Vancouver:
Fang ZJ. Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1853/64129.
Council of Science Editors:
Fang ZJ. Mass Transport and Durability of Proton-Exchange-Membrane Fuel Cell Electrodes. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/64129
4.
Ahlam Abdulwahab Ahmed Al Alas.
Synthesis, characterization and electrical porperties of
oxide–ion conductors; -.
Degree: Chemistry, 2010, Aligarh Muslim University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/12865
► Oxide ion conductors have been attracted much attention during past years in view of its potential applications in many solid oxide devices; especially in solid…
(more)
▼ Oxide ion conductors have been attracted much
attention during past years in view of its potential applications
in many solid oxide devices; especially in solid oxide fuel cells
(SOFCs).Many oxide ion conductors of BIMEVOX family have been
demonstrated to be good candidates for SOFC application due to
their high ionic conduction at moderate temperatures. It has been
found that almost all studies BIMEVOX materials are conventionally
prepared by solid state reactions. Although, the solid state
reaction is widespread used for preparation of oxide ion
conductors, it offers several disadvantages. This research work
titled «Synthesis, characterization and electrical properties of
oxide ion conductors» has been devoted to synthesize new oxide ion
conductors of the BIMEVOX family, employing two alternative methods
of preparation, namely sol gel and microwave assisted synthesis,
which are more recently originated for preparing homogeneous single
phase solids with the ensuring time and energy savings. The present
Ph.D. thesis is divided into five main chapters, which can be
summarized as follows: CHAPTER ONE: General Introduction
newlineFuel cells are electrochemical energy devices in which the
electricity is generated at the electrode/electrolyte interface
through chemical reactions. The electrolyte is the most important
and indispensable part of the fuel cell, which permits ion
transport between the electrodes. The fuel cells are categorized
based on mobile ionic species that electrolyte can conduct: (i)
Proton exchange membrane fuel cells (PEMFC). (ii) Alkaline fuel
cells (AFC). (iii) Phosphoric acid fuel cells (PAFC). (iv) Molten
carbonate fuel cells (MCFC). (v) Solid oxide fuel cells (SOFC). The
main advantage of SOFC over other fuel cells is that it has the
highest electrical efficiency (60 %) at high operation temperatures
( gt 700 °C). SOFCs are based on an oxide ion conductor, which
allows the migration of oxide ions, O2 from the cathode to the
anode and thereafter react with the fuel to generate electrical
power.
References given chapter wise
Advisors/Committee Members: Saba Beg.
Subjects/Keywords: Chemistry; fuel cell
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APA (6th Edition):
Alas, A. A. A. A. (2010). Synthesis, characterization and electrical porperties of
oxide–ion conductors; -. (Thesis). Aligarh Muslim University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/12865
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alas, Ahlam Abdulwahab Ahmed Al. “Synthesis, characterization and electrical porperties of
oxide–ion conductors; -.” 2010. Thesis, Aligarh Muslim University. Accessed March 07, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/12865.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alas, Ahlam Abdulwahab Ahmed Al. “Synthesis, characterization and electrical porperties of
oxide–ion conductors; -.” 2010. Web. 07 Mar 2021.
Vancouver:
Alas AAAA. Synthesis, characterization and electrical porperties of
oxide–ion conductors; -. [Internet] [Thesis]. Aligarh Muslim University; 2010. [cited 2021 Mar 07].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12865.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alas AAAA. Synthesis, characterization and electrical porperties of
oxide–ion conductors; -. [Thesis]. Aligarh Muslim University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12865
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
5.
Chen, Zhu.
Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries.
Degree: 2012, University of Waterloo
URL: http://hdl.handle.net/10012/6718
► Metal air battery has captured the spotlight recently as a promising class of sustainable energy storage for the future energy systems. Metal air batteries offer…
(more)
▼ Metal air battery has captured the spotlight recently as a promising class of sustainable energy storage for the future energy systems. Metal air batteries offer many attractive features such as high energy density, environmental benignity, as well as ease of fuel storage and handling. In addition, wide range of selection towards different metals exists where different energy capacity can be achieved via careful selection of different metals. The most energy dense systems of metal-air battery include lithium-air, aluminum-air and zinc-air. Despite the choice of metal electrode, oxygen reduction (ORR) occurs on the air electrode and oxidation occurs on the metal electrode. The oxidation of metal electrode is a relatively facile reaction compared to the ORR on the air electrode, making latter the limiting factor of the battery system. The sluggish ORR kinetics greatly affects the power output, efficiency, and lifetime of the metal air battery. One solution to this problem is the use of active, affordable and stable catalyst to promote the rate of ORR. Currently, platinum nanoparticles supported on conductive carbon (Pt/C) are the best catalyst for ORR. However, the prohibitively high cost and scarcity of platinum raise critical issues regarding the economic feasibility and sustainability of platinum-based catalysts. Cost reduction via the use of novel technologies can be achieved by two approaches. The first approach is to reduce platinum loading in the catalyst formulation. Alternatively platinum can be completely eliminated from the catalyst composition. The aim of this work is to identify and synthesize alternative catalysts for ORR toward metal air battery applications without the use of platinum re other precious metals (i.e., palladium, silver and gold).
Non-precious metal catalysts (NPMC) have received immense international attentions owing to the enormous efforts in pursuit of novel battery and fuel cell technologies. Different types of NPMC such as transition metal alloys, transition metal or mixed metal oxides, chalcogenides have been investigated as potential contenders to precious metal catalysts. However, the performance and stability of these catalysts are still inferior in comparison. Nitrogen-doped carbon materials (NCM) are an emerging class of catalyst exhibiting great potential towards ORR catalysis. In comparison to the metal oxides, MCM show improved electrical conductivity. Furthermore, NCM exhibit higher activity compared to chalcogenides and transition metal alloys. Additional benefits of NCM include the abundance of carbon source and environmental benignity. Typical NCM catalyst is composed of pyrolyzed transition metal macrocycles supported by high surface area carbon. These materials have demonstrated excellent activity and stability. However, the degradation of these catalysts often involves the destruction of active sites containing the transition metal centre. To further improve the durability and mass transport of NCM catalyst, a novel class of ORR catalyst based on nitrogen-doped…
Subjects/Keywords: Fuel cell; Battery
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APA (6th Edition):
Chen, Z. (2012). Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Zhu. “Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries.” 2012. Thesis, University of Waterloo. Accessed March 07, 2021.
http://hdl.handle.net/10012/6718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Zhu. “Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries.” 2012. Web. 07 Mar 2021.
Vancouver:
Chen Z. Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries. [Internet] [Thesis]. University of Waterloo; 2012. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10012/6718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen Z. Nitrogen-Doped Carbon Materials as Oxygen Reduction Reaction Catalysts for Metal-Air Fuel Cells and Batteries. [Thesis]. University of Waterloo; 2012. Available from: http://hdl.handle.net/10012/6718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of the Western Cape
6.
Klaas, Lutho Attwell.
Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
.
Degree: 2018, University of the Western Cape
URL: http://hdl.handle.net/11394/6448
► The anode catalyst is one of the important parts of the direct alcohol fuel cell (DAFC); it is responsible for the alcohol oxidation reaction (AOR)…
(more)
▼ The anode catalyst is one of the important parts of the direct alcohol
fuel cell (DAFC); it is
responsible for the alcohol oxidation reaction (AOR) takes place at the anode side. Pd has
been reported to have good alcohol oxidation reactions and good stability in alkaline solution.
Better stability and activity has been reported for Pd alloyed catalysts when compared to Pd.
Choosing a suitable alcohol also has an effect on the activity and stability of the catalyst. This
study investigates the best catalyst with better AOR and the best stability and also looks at the
better alcohol to use between glycerol and ethanol for the five in-house catalysts (20% Pd,
PdNi, PdNiO, PdMn3O4 and PdMn3O4NiO on multi walled carbon nanotubes) using cyclic
voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance
spectrometry (EIS) and chronoamperometry. HR-TEM and XRD techniques were used to
determine the particle size and average particle size, respectively while EDS used to
determine elemental composition and ICP was used to determine catalyst loading.
It was observed from LSV that PdNiO was the most active catalyst for both ethanol and
glycerol oxidation, and it was the most stable in ethanol while PdMn3O4 proved to be the
most stable catalyst in glycerol observed using chronoamperometry. The best alcohol in this
study was reported to be glycerol having given the highest current densities for all the inhouse
catalysts compared to ethanol observed using LSV. From XRD and HR-TEM studies,
particle sizes were in the range of 0.97 and 2.69 nm for XRD 3.44 and 7.20 nm for HR-TEM
with a little agglomeration for PdMn3O4 and PdMn3O4NiO.
Advisors/Committee Members: Khotseng, Lindiwe (advisor).
Subjects/Keywords: Proton exchange membrane fuel cell; Solid oxide fuel cell; Phosphoric acid fuel cell; Molten carbonate fuel cell; Alkaline fuel cell
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APA (6th Edition):
Klaas, L. A. (2018). Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/6448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Klaas, Lutho Attwell. “Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
.” 2018. Thesis, University of the Western Cape. Accessed March 07, 2021.
http://hdl.handle.net/11394/6448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Klaas, Lutho Attwell. “Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
.” 2018. Web. 07 Mar 2021.
Vancouver:
Klaas LA. Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
. [Internet] [Thesis]. University of the Western Cape; 2018. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/11394/6448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Klaas LA. Synthesis and characterization of binary Palladium based electrocatalysts towards alcohol oxidation for fuel cell application
. [Thesis]. University of the Western Cape; 2018. Available from: http://hdl.handle.net/11394/6448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
7.
Jost, William C.
Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte.
Degree: MS, Mechanical Engineering, 2008, Oregon State University
URL: http://hdl.handle.net/1957/8178
► A Mixed Reactant Single Chamber (MRSC) Fuel Cell is a relatively recent concept in the field of fuel cell engineering originally developed in the late…
(more)
▼ A Mixed Reactant Single Chamber (MRSC)
Fuel Cell is a relatively recent concept in the field of
fuel cell engineering originally developed in the late 1950’s. Typical
fuel cells have separated reactants (a separated
fuel and oxidizer) that react on their usually non-selective electro-catalytic materials. A mixed reactant
fuel cell uses a mixed reactant source (a
fuel and oxidant mixed gas). The use of selective catalytic materials in the MRSC
fuel cell eliminates the need for high cost filtering and separation of the reactant gases. The intended application of an MRSC
fuel cell is to exploit the energy of a decaying radioactive power source that produces, via water radiolysis, a mixture of hydrogen and oxygen gasses through the decomposition of water. This mixed reactant source, can power an MRSC
fuel cell to produce power on a small scale for an extended period of time. Described within, water electrolysis is used to simulate the process of water radiolysis, in turn providing a mixed reactant source and powering the MRSC
fuel cell. In a closed and controlled environment test, the electrolysis of a 0.5 Mol KOH electrolyte solution in combination with a platinized platinum mesh anode and porous silver cathode yielded a max power density for the MRSC
fuel cell of 129 µW cm-2.
Advisors/Committee Members: Peterson, Dr. Richard (advisor), Paul, Dr. Brian (committee member).
Subjects/Keywords: Fuel Cell; Fuel cells – Design and construction
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APA (6th Edition):
Jost, W. C. (2008). Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/8178
Chicago Manual of Style (16th Edition):
Jost, William C. “Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte.” 2008. Masters Thesis, Oregon State University. Accessed March 07, 2021.
http://hdl.handle.net/1957/8178.
MLA Handbook (7th Edition):
Jost, William C. “Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte.” 2008. Web. 07 Mar 2021.
Vancouver:
Jost WC. Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte. [Internet] [Masters thesis]. Oregon State University; 2008. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1957/8178.
Council of Science Editors:
Jost WC. Mixed reactant single chamber fuel cell,
using products generated from the electrolysis of an
aqueous electrolyte. [Masters Thesis]. Oregon State University; 2008. Available from: http://hdl.handle.net/1957/8178
Loughborough University
8.
Bhatti, Wasim.
Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure.
Degree: PhD, 2016, Loughborough University
URL: http://hdl.handle.net/2134/21513
► A multifunctional structural polymer electrolyte membrane (PEM) fuel cell was designed, developed and manufactured. The structural fuel cell was designed to represent the rear rib…
(more)
▼ A multifunctional structural polymer electrolyte membrane (PEM) fuel cell was designed, developed and manufactured. The structural fuel cell was designed to represent the rear rib section of an aircraft wing. Custom membrane electrode assemblies (MEA s) were manufactured in house. Each MEA had an active area of 25cm2.The platinum loading on each electrode (anode and cathode) was 0.5mg/cm2. Sandwiched between the electrodes was a Nafion 212 electrolyte membrane. Additional components of the structural fuel included metallic bipolar plates and end plates. Initially all the components were manufactured from aluminium in order for the structural fuel cell to closely represent an aircraft wing rib. However due to corrosion problems the bipolar plate had to be manufactured from marine grade 361L stainless steel with a protective coating system. A number of different protective coating systems were tried with wood nickel strike, followed by a 5μm intermediate coat of silver and a 2μm gold top coat being the most successful. Full fuel cell experimental setup was developed which included balance of plant, data acquisition and control unit, and a mechanical loading assembly. Loads were applied to the structural fuel cells tip to achieve a static deflection of ±7mm and dynamic deflections of ±3mm, ±5mm, and ±7mm. Static and dynamic torsion induced 1° to 5° of twist to the structural fuel cell tip. Polarisation curves were produced for each load case. Finite element analysis was used to determine the structural fuel cell displacement, and stress/strain over the range of mechanical loads. The structural fuel cells peak power performance dropped 3.9% from 5.5 watts to 5.3 watts during static bending and 2% from 6.2 watts to 6.1 watts during static torsion. During dynamic bending (2000 cycles) the structural fuel cell peak power performance dropped 11% from 6.7 watts to 6 watts (3mm deflection at 190N), 23% from 6.3 watts to 4.8 watts (5mm deflection at 270N), and 41% from 7.2 watts to 5 watts (7mm deflection at 350N). During dynamic torsion (2000 cycles) the structural fuel cell peak power performance dropped 16% from 6 watts to 5.1 watt (3° of torsional loading), and 30% from 6.4 watts to 4.3 watts (5° of torsional loading). The simulated (finite element modelling) displacement of -6.6mm (At maximum bending load of 364.95N) was within 9% of the actual measured displacement of -7.2mm at 364.95N. Furthermore the majority of the simulated strain values were within 10% of the actual measured strain for the structural fuel cell.
Subjects/Keywords: 621.31; Polymer electrolye membrane fuel cell; PEM fuel cell; Mulitfunctional structure; Corrosion; Structural fuel cell
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APA (6th Edition):
Bhatti, W. (2016). Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/21513
Chicago Manual of Style (16th Edition):
Bhatti, Wasim. “Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure.” 2016. Doctoral Dissertation, Loughborough University. Accessed March 07, 2021.
http://hdl.handle.net/2134/21513.
MLA Handbook (7th Edition):
Bhatti, Wasim. “Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure.” 2016. Web. 07 Mar 2021.
Vancouver:
Bhatti W. Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure. [Internet] [Doctoral dissertation]. Loughborough University; 2016. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2134/21513.
Council of Science Editors:
Bhatti W. Mechanical integration of a PEM fuel cell for a multifunctional aerospace structure. [Doctoral Dissertation]. Loughborough University; 2016. Available from: http://hdl.handle.net/2134/21513
University of Alberta
9.
Mangal, Prafful.
Experimental Study of Mass Transport Parameters of PEMFC
Porous Media.
Degree: MS, Department of Mechanical Engineering, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/8623hz095
► An experimental set up based on a diffusion bridge is developed to accurately determine the in-plane and through-plane permeability, Knudsen diffusivity and effective molecular diffusivity…
(more)
▼ An experimental set up based on a diffusion bridge is
developed to accurately determine the in-plane and through-plane
permeability, Knudsen diffusivity and effective molecular
diffusivity of gas diffusion layers used in PEFC. The parameters
are estimated under various compression levels in in-plane
direction. The effect of PTFE on transport parameters is studied in
both directions while effect of MPL is studied only in through
plane direction. In order to estimate permeability, nitrogen is
introduced in one channel, passed through the porous sample, and
the pressure drop is measured. Knudsen diffusivity is measured by
conducting the permeability experiments with gases of different
mean paths i.e. nitrogen and helium. The difference in permeability
results was attributed to Knudsen slip. To measure diffusivity,
nitrogen and oxygen are introduced in two channels separated by the
porous media. By applying a pressure differential between the
channels, ratio of convection and diffusion is modified, and the
oxygen concentration is measured in the nitrogen channel.
Permeability and effective molecular diffusivity are estimated from
pressure drop and oxygen concentration measurements using a
one-dimensional mass transport model. In this study, a steady state
Fick's and Darcy's law model is used for gas diffusion layers while
Modified Binary Friction Model is used for GDL+MPL assembly for
through plane direction. Permeability and effective diffusivity are
measured for SIGRACET SGL and several Toray samples with different
PTFE loading. Results show that in-plane permeability reduces with
compression and amount of PTFE in porous media. In-plane
diffusivity decreases with compression, due to decreasing porosity,
and with increasing PTFE content. Through plane permeability,
Knudsen diffusivity and effective diffusivity also decreases with
PTFE content. Coating of an MPL on GDL samples introduces
significant Knudsen slip, increasing amount of PTFE in the presense
of MPL also reduces permeability, Knudsen diffusivity and effective
diffusivity of porous media.
Subjects/Keywords: Cell; Mass; PEM; Fuel; Transport
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APA (6th Edition):
Mangal, P. (2014). Experimental Study of Mass Transport Parameters of PEMFC
Porous Media. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8623hz095
Chicago Manual of Style (16th Edition):
Mangal, Prafful. “Experimental Study of Mass Transport Parameters of PEMFC
Porous Media.” 2014. Masters Thesis, University of Alberta. Accessed March 07, 2021.
https://era.library.ualberta.ca/files/8623hz095.
MLA Handbook (7th Edition):
Mangal, Prafful. “Experimental Study of Mass Transport Parameters of PEMFC
Porous Media.” 2014. Web. 07 Mar 2021.
Vancouver:
Mangal P. Experimental Study of Mass Transport Parameters of PEMFC
Porous Media. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Mar 07].
Available from: https://era.library.ualberta.ca/files/8623hz095.
Council of Science Editors:
Mangal P. Experimental Study of Mass Transport Parameters of PEMFC
Porous Media. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/8623hz095
Cornell University
10.
Kostalik IV, Henry.
The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells.
Degree: PhD, Chemistry and Chemical Biology, 2011, Cornell University
URL: http://hdl.handle.net/1813/30655
► Fuel cells are devices that convert the chemical energy stored in a fuel directly into electricity and have the potential to serve as a highly…
(more)
▼ Fuel cells are devices that convert the chemical energy stored in a
fuel directly into electricity and have the potential to serve as a highly efficient and environmentally sustainable power generation technology for stationary and mobile applications. Within a
fuel cell, the polymer electrolyte membrane serves as the ion conducting medium between the anode and cathode, making it a central, and often performance-limiting component of the
fuel cell. The most common polymer electrolyte membrane
fuel cells operate under acidic conditions and are therefore proton conducting. Although proton exchange membrane (PEM)
fuel cells are well developed and can offer excellent performance, they rely almost exclusively on platinum, a very expensive and scarce noble metal. This dependence on platinum has severely hindered wide scale commercialization of PEM
fuel cell technologies. By comparison, alkaline
fuel cells that employ hydroxide conducting alkaline anion exchange membranes (AAEMs) are relatively unexplored. A major advantage of alkaline
fuel cells, when compared to acidic
fuel cells, is their enhanced reaction kinetics for oxygen reduction, permitting the use of less costly, non-noble metal catalysts (e.g. Ni). Therefore, high performance AAEMs could significantly advance
fuel cell technologies. We have been working to develop new polymeric materials that can serve as effective AAEMs. Prior work in this area has mainly focused on re-engineering existing materials to access AAEMs. In contrast, we approached this problem from a synthetic perspective by designing and synthesizing materials from the ground up. Herein, the synthesis of two separate AAEM systems that are synthesized via ring-opening metathesis polymerization are described. The first route involves the copolymerization of a tetraalkylammonium-functionalized norbornene with dicyclopentadiene. The crosslinked thin films generated are mechanically strong and exhibit exceptional methanol tolerance. The second route involves the synthesis of a solvent processable, tetraalkylammonium-functionalized polyethylene for use as an AAEM. The membranes are insoluble in both pure water and aqueous methanol but exhibit excellent solubility in a variety of other aqueous alcohols. These solubility characteristics extend the utility of this system for use as both an AAEM and ionomer electrode material from a single polymer composition. The AAEMs generated are mechanically strong and exhibit high hydroxide conductivities. Lastly, we have developed a standardized procedure for measuring the alkaline stability of a benzyltrimethylammonium (BTMA) model compound and a BTMA functionalized polyethylene. The procedure is broadly applicable and should serve as a testing method to better understand other systems, specifically those based on novel cations. Applying this procedure should facilitate the discovery of AAEMs with increased base stability, thus enabling high temperature AAEM
fuel cell operation.
Advisors/Committee Members: Coates, Geoffrey (chair), Sogah, Dotsevi Y (committee member), Abruna, Hector D (committee member).
Subjects/Keywords: polymer; membrane; fuel cell
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APA (6th Edition):
Kostalik IV, H. (2011). The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/30655
Chicago Manual of Style (16th Edition):
Kostalik IV, Henry. “The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells.” 2011. Doctoral Dissertation, Cornell University. Accessed March 07, 2021.
http://hdl.handle.net/1813/30655.
MLA Handbook (7th Edition):
Kostalik IV, Henry. “The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells.” 2011. Web. 07 Mar 2021.
Vancouver:
Kostalik IV H. The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells. [Internet] [Doctoral dissertation]. Cornell University; 2011. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1813/30655.
Council of Science Editors:
Kostalik IV H. The Design And Synthesis Of High Performance Polyolefins For Use In Alkaline Anion Exchange Membrane Fuel Cells. [Doctoral Dissertation]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/30655
Georgia Tech
11.
Kim, Jun Hyuk.
Operando raman spectroscopy study of electrode surfaces.
Degree: PhD, Chemical and Biomolecular Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62248
► Solid oxide fuel cells (SOFCs) are promising energy technology providing high efficiency with low emission. For SOFCs, a little modification on electrode surface can either…
(more)
▼ Solid oxide
fuel cells (SOFCs) are promising energy technology providing high efficiency with low emission. For SOFCs, a little modification on electrode surface can either dramatically enhance or hinder electrode processes. However, the inability to probe surface species/phases under operating conditions, the lack of information on the local properties of hot spots on heterogeneous surfaces, and the inadequate understanding of electro-catalytic mechanisms remain as critical challenges to understand corrosion/promoting dynamics of electrode surfaces. To tackle these problems, I used in situ/operando Raman spectroscopy coupled with electrochemical impedance spectroscopy as a powerful tool to monitor electrode surfaces. Therefore, I provided scientific basis for knowledge-based design of durable anodes against sulfur-poisoning and high-performance cathode for oxygen reduction reaction. Combination of in situ/operando measurements and density functional theory (DFT) calculation offers an effective approach to unravel the mechanisms of electrode reactions, and the developed methodology is applicable to study electrode/catalyst materials in other chemical and electrochemical systems as well.
Advisors/Committee Members: Liu, Meilin (advisor), Fuller, Thomas (advisor), Meredith, Carson (committee member), Hess, Dennis (committee member), Zhang, John (committee member).
Subjects/Keywords: Fuel cell; Raman spectroscopy
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APA (6th Edition):
Kim, J. H. (2018). Operando raman spectroscopy study of electrode surfaces. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62248
Chicago Manual of Style (16th Edition):
Kim, Jun Hyuk. “Operando raman spectroscopy study of electrode surfaces.” 2018. Doctoral Dissertation, Georgia Tech. Accessed March 07, 2021.
http://hdl.handle.net/1853/62248.
MLA Handbook (7th Edition):
Kim, Jun Hyuk. “Operando raman spectroscopy study of electrode surfaces.” 2018. Web. 07 Mar 2021.
Vancouver:
Kim JH. Operando raman spectroscopy study of electrode surfaces. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1853/62248.
Council of Science Editors:
Kim JH. Operando raman spectroscopy study of electrode surfaces. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62248
12.
Savinder Preet Kaur.
A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -.
Degree: Chemistry, 2003, Punjab Technical University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/8950
► Fuel cells are emerging as an alternative for the direct conversion of fossil fuel to electrical energy. Solid Oxide Fuel Cells (SOFCs) are particularly attractive…
(more)
▼ Fuel cells are emerging as an alternative for the
direct conversion of fossil fuel to electrical energy. Solid Oxide
Fuel Cells (SOFCs) are particularly attractive because they have
the highest efficiency of any conventional fuel cell design and the
potential to use many fuels including gasoline and diesel without
expensive external reformers that create more volatile chemicals.
Solid oxide fuel cells (SOFC) are very attractive due to their high
efficiency and very low pollutant emission. Until now, solid oxide
fuel cell systems have been based mainly on Yttria-stabilized
zirconia (YSZ) ceramics because of their nearly pure oxygen
conductivity in oxidizing and reducing atmospheres as well as good
mechanical properties. ZrO2-based electrolytes however require high
operating temperature of 1000°C in order to maintain high oxygen
ionic conductivity. Major promising advancements have been achieved
in recent years in the area of high temperature fuel cells (SOFCs).
These high operating temperatures demand large fabrication costs
and accelerate the degradation of the fuel cell systems, expensive
materials for fuel cell interconnector, long start-up time and
large energy input to heat the cell up to the operating
temperature. Therefore, if fuel cells could be designed to give a
reasonable power output at intermediate temperatures (IT,
400-700°C), tremendous benefits may result. In particular, in the
IT range ferrite steel interconnects can be used instead of
expensive and brittle ceramic materials. In addition, sealing
becomes easier and more reliable; rapid start-up is possible;
thermal stresses (caused by thermal expansion mismatches) are
reduced; electrode sintering becomes negligible. Combined together,
all these improvements result in reduced initial and operating
costs. Therefore, the major trend in the present research
activities on SOFCs is the reduction of the operating temperature.
The problem is that lowering the operating temperatures lowers the
electrolyte conductivity.
Bibliography p.144-156
Advisors/Committee Members: Singh, Anirudh P, Sharma, Sangeeta.
Subjects/Keywords: Chemistry; Fuel Cell Technology; Microwave
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APA (6th Edition):
Kaur, S. P. (2003). A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -. (Thesis). Punjab Technical University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/8950
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kaur, Savinder Preet. “A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -.” 2003. Thesis, Punjab Technical University. Accessed March 07, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/8950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kaur, Savinder Preet. “A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -.” 2003. Web. 07 Mar 2021.
Vancouver:
Kaur SP. A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -. [Internet] [Thesis]. Punjab Technical University; 2003. [cited 2021 Mar 07].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kaur SP. A study of materials for fabrication of intermediate
temperature solid oxide fuel cells electrolyte using microwave
energy; -. [Thesis]. Punjab Technical University; 2003. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8950
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
13.
Su, Qing.
Nanoengineered Thin Films for Solid Oxide Fuel Cells.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66621
► Solid oxide fuel cells (SOFCs) are very attractive as energy generation devices because of their high energy efficiency, flexible fuel selections and clean energy conversion.…
(more)
▼ Solid oxide
fuel cells (SOFCs) are very attractive as energy generation devices because of their high energy efficiency, flexible
fuel selections and clean energy conversion. To avoid
cell cracking and formation of non-conducting compounds at electrolyte/electrode interfaces issues caused by high operating temperatures (~1000 ??C for conventional SOFCs), intermediate temperature SOFCs (ITSOFCs) in the range of 500-700 ??C have attracted extensive research interests. However, the polarization loss of cathode and ohmic loss of electrolyte significantly increases under reduced temperatures which lead to decreased
cell performance and power output. To address the above issues, the efforts in this work are focused on engineering microstructure of cathode, electrolyte and their interface to achieve high performance.
First, a bi-layer method has been developed to prepare La0.5Sr0.5CoO3 (LSCO) cathode by combining a pulsed laser deposition (PLD) technique and a screen printing method. It provides a cost-effective approach to fabricate thick and high quality cathode films and the method could also be applied to many other cathode systems. Second, detailed PLD interlayer thickness effect is investigated. The mechanical and electrochemical properties of those hybrid cathodes are examined and correlated with the microstructure of the cells with different interlayer thicknesses. Third, partial oxygen pressure AC impedance study has been carried on those bi-layer cathodes with different interlayer thicknesses. The guidelines for designing high-performance bi-layer cathodes with optimum performance and low cost are proposed. Fourth, the design of a La0.8Sr0.2MnO3-??/Zr0.92Y0.08O2 thin interlayer with a vertically-aligned nanocomposite (VAN) structure between the electrolyte and oxygen electrode is demonstrated for solid oxide reversible
fuel cells. The VAN structure significantly improves the overall
cell performance and also acts as a transition layer that improves adhesion and relieves both thermal stress and lattice strain. Fifth, Two-phase (Ce0.9Gd0.1O1.95)0.5/(Zr0.92Y0.08O1.96)0.5 nanocomposite thin films with vertically aligned structure are grown as the electrolyte for thin film solid oxide
fuel cells (TFSOFCs). More than 50% increase in overall power density is achieved compared with that of the cells without VAN electrolyte.
Advisors/Committee Members: Wang, Haiyan (advisor).
Subjects/Keywords: Solid oxide fuel cell
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APA (6th Edition):
Su, Q. (2013). Nanoengineered Thin Films for Solid Oxide Fuel Cells. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Su, Qing. “Nanoengineered Thin Films for Solid Oxide Fuel Cells.” 2013. Thesis, Texas Digital Library. Accessed March 07, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Su, Qing. “Nanoengineered Thin Films for Solid Oxide Fuel Cells.” 2013. Web. 07 Mar 2021.
Vancouver:
Su Q. Nanoengineered Thin Films for Solid Oxide Fuel Cells. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Su Q. Nanoengineered Thin Films for Solid Oxide Fuel Cells. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
14.
Nan, Feihong.
Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy.
Degree: PhD, 2015, McMaster University
URL: http://hdl.handle.net/11375/18450
► The goal of current research is probing the relationship between catalyst features and the fuel cell performance with a range of in-depth structural analysis. The…
(more)
▼ The goal of current research is probing the relationship between catalyst features and
the fuel cell performance with a range of in-depth structural analysis. The study
investigated different catalyst systems including core-shell structured catalyst, catalysts
with unique carbon-transition metal oxide supports.
PtRu catalysts nanoparticles with unique core-shell structure, one of the most
practical catalysts in PEMFC technology, have been successfully obtained with the
evidence from the characterization results. It is found that the enhanced CO oxidation
may be achieved through the interactions between the Pt shell and Ru core atoms, which
can modify the electronic structure of the Pt surface by the presence of subsurface Ru
atoms or by disrupting the Pt surface arrangement. Furthermore, the possibility of
presence of the compressive strain within the Pt rich shell is proved by the lattice
measurements, which could significantly affect the catalytic activity.
Pt catalysts supported on complex oxide and carbon support were studied to
investigate the relationship between the catalyst and its support. Observations from
STEM images and HAADF and energy dispersive X-ray spectrometry demonstrate the
preferential distribution of Pt nanoparticles on the hybrid supports, which include Nb2O3
/ C, Ta2O5 / C, (Nb2O3+TiOx) / C, (Ta2O5+TiOx) / C, and (WO3+TiOx)/C). Such
evidence indicates the interaction between the catalyst and support is based on the
presence of an interconnected oxide network over the carbon support and the presence of
Pt strongly connected to the oxide network. In addition, using electron energy loss
spectroscopy (EELS), the electronic structure of the catalyst support under various
conditions was also studied to provide further evidence of the strong metal support
interaction effect.
Thesis
Doctor of Philosophy (PhD)
Advisors/Committee Members: Botton, Gianluigi, Materials Science and Engineering.
Subjects/Keywords: Fuel Cell; Analytical Electron Microscopy
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Manager
APA (6th Edition):
Nan, F. (2015). Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/18450
Chicago Manual of Style (16th Edition):
Nan, Feihong. “Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy.” 2015. Doctoral Dissertation, McMaster University. Accessed March 07, 2021.
http://hdl.handle.net/11375/18450.
MLA Handbook (7th Edition):
Nan, Feihong. “Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy.” 2015. Web. 07 Mar 2021.
Vancouver:
Nan F. Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy. [Internet] [Doctoral dissertation]. McMaster University; 2015. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/11375/18450.
Council of Science Editors:
Nan F. Characterization of Catalyst Materials for PEMFCs using Analytical Electron Microscopy. [Doctoral Dissertation]. McMaster University; 2015. Available from: http://hdl.handle.net/11375/18450
Penn State University
15.
Stager, Jennifer L.
Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/26687
► Microbial fuel cells (MFCs) have been shown to simultaneously treat wastewater and generate electricity. Scaling up MFCs will require compact and efficient reactor designs, stable…
(more)
▼ Microbial
fuel cells (MFCs) have been shown to simultaneously treat wastewater and generate electricity. Scaling up MFCs will require compact and efficient reactor designs, stable performance, inexpensive electrode materials, and high power production using domestic wastewater. In this study, small graphite fiber brush anodes were used in larger-scale MFCs to determine if stable anode potentials and high power production could be achieved when using domestic wastewater in fed batch and continuous flow modes. Additionally, a new activated carbon cathode material incorporating nitrogen and phosphorus was tested in cube MFCs to determine if power generation would be higher compared to other activated carbon cathode materials when using a phase inversion process to produce these cathodes.
Small diameter graphite brush anodes were examined using three different cathode configurations: a platinum catalyst on carbon cloth without a separator (Pt-NS); a platinum catalyst on carbon cloth with polyvinyl alcohol (PVA) (Pt-PVA) separator; and an activated carbon cathode with cloth separator (AC-CS). The Pt-NS and Pt-PVA configurations achieved similar maximum power densities in batch mode, but the Pt-NS had a lower maximum power density in continuous flow mode. Long-term operation using wastewater and the Pt-NS cathode resulted in erratic anode performance based on power generation in continuous flow mode, likely as a result of oxygen contamination of the anodes. The use of a PVA separator to reduce oxygen crossover into the anode chamber did not stabilize performance. An AC-CS cathode was then examined as a method to restore anode performance, but this cathode produced only half the maximum power density obtained with the Pt-NS or Pt-PVA MFCS operated in fed batch mode. It was hypothesized that the poor stability in performance of the MFC was due to low wastewater strength. Therefore, the wastewater was amended with 1 g/L sodium acetate and operated using the AC-CS cathode in continuous flow mode. The use of the acetate amended wastewater resulted in stable operation and reproducible performance between replicate reactors. The anodes had a high negative potential and polarization data did not show signs of power overshoot. This indicates that the graphite fiber brush anodes will perform better under high COD conditions.
An alternative cathode material was examined in separate tests using smaller cube type MFCs to determine if incorporating nitrogen and phosphorus into the activated carbon material would improve performance, as reported by others by a press process, when cathodes were instead constructed using a phase inversion process. After immersing cellulose in an ammonium phosphate solution, allowing it to air dry, and then heating in a nitrogen atmosphere at 5°C/min to 900°C, this material was then used to make a cathode by a phase inversion process. The power performance achieved with this dual doped cellulose-derived activated carbon cathode (cellulose N+P) was compared to a plain, self-manufactured cellulose activated…
Advisors/Committee Members: Bruce Ernest Logan, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Microbial Fuel Cell; Anode; Cathode
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Stager, J. L. (2015). Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/26687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Stager, Jennifer L. “Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.” 2015. Thesis, Penn State University. Accessed March 07, 2021.
https://submit-etda.libraries.psu.edu/catalog/26687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Stager, Jennifer L. “Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.” 2015. Web. 07 Mar 2021.
Vancouver:
Stager JL. Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 07].
Available from: https://submit-etda.libraries.psu.edu/catalog/26687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Stager JL. Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/26687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
16.
Rostamikia, Gholamreza.
FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS.
Degree: 2011, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/12100
► Direct borohydride fuel cells (DBFC’s) have the potential to convert chemical energy to electrical energy from a high energy density sodium borohydride aqueous fuel, making…
(more)
▼ Direct borohydride
fuel cells (DBFC’s) have the potential to convert chemical energy to electrical energy from a high energy density sodium borohydride aqueous
fuel, making them attractive for small-scale, portable power applications. Poor anode efficiency limits DBFC application. For my Masters of Science thesis published in December 2009, I studied the borohydride oxidation mechanism over the Au(111) and Pt(111) surfaces. I applied density functional theory (DFT) methods to compute reaction free energies as a function of electrode potential. Stable surface intermediates and likely limiting steps were identified. In this doctoral dissertation, borohydride oxidation electrokinetics over the Au(111) surface are predicted using first-principles determined elementary rate constants and a microkinetic model. A method to approximate the potential dependent elementary step activation barriers based on density functional theory calculations is developed and applied to the minimum energy path for borohydride oxidation. Activation barriers of the equivalent non-electrochemical reactions are calculated and made potential dependent using a method similar to Butler-Volmer kinetics. The kinetic controlled region of the borohydride oxidation reaction linear sweep voltammogram over the Au(111) surface is simulated. The simulation results suggest that BH2OH and BH3 are stable surface intermediates at potentials where an oxidation current is observed. Surface-enhanced Raman spectroscopy shows that BH3 is a stable intermediate.
A new catalyst is proposed for the borohydride electrooxidation reaction. Gold-copper binary metals are predicted to increase the activity compared to a pure gold electrode, while maintaining the selectivity comparable to gold. The Au-Cu catalyst is prepared using electrodeposition and examined by linear sweep voltammetry experiments. A Au88.5Cu11.5 electrode decreased the anodic overpotential by 0.17 V, however the surface is not stable at potentials above -0.2 V (NHE). Binding energies and adsorption free energies of the BH4- ion over other surface alloys are also examined and reported.
Advisors/Committee Members: Michael J. Janik, Committee Chair/Co-Chair, Themis Matsoukas, Committee Member, Janna Maranas, Committee Member, Michael Hickner, Committee Member.
Subjects/Keywords: Borohydride; Fuel Cell; DBFC
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APA (6th Edition):
Rostamikia, G. (2011). FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/12100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rostamikia, Gholamreza. “FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS.” 2011. Thesis, Penn State University. Accessed March 07, 2021.
https://submit-etda.libraries.psu.edu/catalog/12100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rostamikia, Gholamreza. “FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS.” 2011. Web. 07 Mar 2021.
Vancouver:
Rostamikia G. FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Mar 07].
Available from: https://submit-etda.libraries.psu.edu/catalog/12100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rostamikia G. FIRST PRINCIPLES GUIDED DESIGN OF BOROHYDRIDE ELECTROOXIDATION CATALYSTS. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/12100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
17.
Furuya, Yoshihisa.
Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
.
Degree: Chemistry, 2014, Queens University
URL: http://hdl.handle.net/1974/12635
► Trifluoromethanesulfonic acid (CF3SO3H) is the smallest fluorinated sulfonic acid and serves as a model imitating the Nafion® ionomer of catalyst layers of polymer electrolyte membrane…
(more)
▼ Trifluoromethanesulfonic acid (CF3SO3H) is the smallest fluorinated sulfonic acid and serves as a model imitating the Nafion® ionomer of catalyst layers of polymer electrolyte membrane fuel cells (PEMFCs). The difference in the electrochemical behavior of Pt in CF3SO3H, as compared to H2SO4 or HClO4, originates from the different anion nature. Because PEMFCs operate in the potential range in which electrochemical reactions involving O and H occur, the thesis focuses on: (i) Pt electro-oxidation; (ii) H electro-adsorption; and (iii) electrochemical and chemical Pt dissolution.
Platinum electro-oxidation in 0.1 M CF3SO3H is studied at various polarization potentials (Ep), polarization times (tp) and temperatures (T). The reaction mechanism is revised and expanded by taking into account possible interactions of cations, anions and water molecules with Pt. A modified kinetic equation for the interfacial place exchange is proposed. The application of the interfacial place exchange and the metal cation escape mechanisms results in the determination of the Pt–O surface dipole moment, as well as the potential drop (Vox) and electric field (Eox) within the oxide. The platinum-anion interactions indirectly affect the surface electro-oxidation kinetics.
The under-potential deposition of H (UPD H) on Pt in CF3SO3H is investigated over a broad T range using cyclic voltammetry. The general electrochemical adsorption isotherm is used to determine standard Gibbs energy, entropy, and enthalpy of electro-adsorption, and energy of the Pt‒HUPD surface bond. The lateral interactions between HUPD adatoms are repulsive.
Platinum electro-dissolution in 0.1 and 0.5 M CF3SO3H, H2SO4, and HClO4 solutions is studied using potential cycling and inductively coupled plasma mass spectrometry. The results demonstrate that the anion nature has no or negligible impact on Pt electro-dissolution; however, pH significantly affects the process and the higher the pH value the greater the electro-dissolution of Pt. An analysis of potential versus pH diagrams (Pourbaix diagrams) for acid solutions of different concentrations demonstrates that dissolved Pt (present as Pt2+ and Pt4+) can form through anodic dissolution of metallic Pt, as well as through anodic electrochemical and chemical dissolution of PtO.
Subjects/Keywords: Platinum
;
Trifluoromethanesulfonic acid
;
Fuel cell
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Export
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APA (6th Edition):
Furuya, Y. (2014). Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/12635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Furuya, Yoshihisa. “Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
.” 2014. Thesis, Queens University. Accessed March 07, 2021.
http://hdl.handle.net/1974/12635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Furuya, Yoshihisa. “Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
.” 2014. Web. 07 Mar 2021.
Vancouver:
Furuya Y. Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
. [Internet] [Thesis]. Queens University; 2014. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1974/12635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Furuya Y. Comprehensive Study of the Electrochemical Behavior of Polycrystalline Platinum Electrodes in Aqueous Solutions of Trifluoromethanesulfonic Acid
. [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/12635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
18.
Wang, Meng.
Novel nanostructured electrocatalysts for fuel
cells.
Degree: Doctor of
Philosophy, Faculty of Science, Medicine and Health, 2015, University of Wollongong
URL: ;
https://ro.uow.edu.au/theses/4440
► Fuel cells (FCs) are believed to be promising energy conversion systems to satisfy today’s increasing energy demand because of their high energy output and…
(more)
▼ Fuel cells (FCs) are
believed to be promising energy conversion systems to
satisfy today’s increasing energy demand because of their
high energy output and zero environmental impact. The
cathodic oxygen reduction reaction (ORR) is recognised to
be kinetically limited step in fuel cell. As commonly
used electrocatalyst, platinum (Pt) has been inhibited
from large-scale production because of its high cost,
susceptive to fuel poisons and low stability. Therefore,
numerous efforts have been devoted in developing novel
nanostructured materials with high efficiency, low cost
and environmental friendliness for the ORR.
The main goal for this study is to design and
develop novel nanostructured electrocatalysts for the ORR
to reduce or replace the utilization of Pt, meanwhile
with acceptable efficiency, better stability as well as
high selectivity to resist the poison from the fuels.
Such catalytic materials will would largely reduce the
cost of catalysts in FCs and improve the cell performance
by facilitating the ORR process and eliminating the
by-products. In this study, two analogue FC systems,
proton exchange membrane fuel cell (PEMFC) and anion
exchange membrane fuel cell (AEMFC) were considered and
different types of electrocatalysts were synthesized and
examined in these systems respectively.
Pt alloy (Pt-Pd, Pt-Cu) electrocatalysts were
firstly synthesized through a facile aqueous based
galvanic replacement and their electrocatalytic
performance was examined in acidic environment and in
PEMFC. One issue that cause the poor
stability of Pt is the aggregation and dissolution of Pt
nanoparticle on carbon black during the long term
electrochemical process. In this study, using the in-situ
localization method, Pt nanoparticles were grown on a
palladium shells through a modified galvanic replacement
forming a Pt-Pd alloyed nanostructure. This material
showed enhanced ORR performance and better stability
under the accelerated durability test (ADT) up to 10,000
cycles. The electrochemical performance of this materials
were analysed through the rotating ring disk electrode
(RRDE) and single H2/O2 proton exchange membrane fuel
cell test. The improved electrocatalytic performance and
better stability were attributed to the unique structure
of Pt/Pd and the strain effects caused by the
incorporation of Pd into the lattice of Pt.
A hollow platinum-copper (PtCu) nanoparticle
with mesoporous features was prepared through a modified
galvanic replacement method using copper nanoparticles as
sacrificial templates. The bimetallic PtCu…
Subjects/Keywords: Electrocatalysts; fuel cell; nanomaterials; graphene
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APA (6th Edition):
Wang, M. (2015). Novel nanostructured electrocatalysts for fuel
cells. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/4440
Chicago Manual of Style (16th Edition):
Wang, Meng. “Novel nanostructured electrocatalysts for fuel
cells.” 2015. Doctoral Dissertation, University of Wollongong. Accessed March 07, 2021.
; https://ro.uow.edu.au/theses/4440.
MLA Handbook (7th Edition):
Wang, Meng. “Novel nanostructured electrocatalysts for fuel
cells.” 2015. Web. 07 Mar 2021.
Vancouver:
Wang M. Novel nanostructured electrocatalysts for fuel
cells. [Internet] [Doctoral dissertation]. University of Wollongong; 2015. [cited 2021 Mar 07].
Available from: ; https://ro.uow.edu.au/theses/4440.
Council of Science Editors:
Wang M. Novel nanostructured electrocatalysts for fuel
cells. [Doctoral Dissertation]. University of Wollongong; 2015. Available from: ; https://ro.uow.edu.au/theses/4440
University of Wollongong
19.
Reid, Mark H.
Metal components of ceramic oxide fuel cells.
Degree: PhD, Faculty of Engineering, 2012, University of Wollongong
URL: 020499
Condensed
Matter
Physics
not
elsewhere
classified,
091207
Metals
and
Alloy
Materials
;
https://ro.uow.edu.au/theses/3647
► The subject of this thesis is the metallurgical stability of an alloy selected for use in a ceramic oxide fuel cell. Fuel cells are…
(more)
▼ The subject of this thesis is the metallurgical stability of an alloy selected for use in a ceramic oxide fuel cell. Fuel cells are a new and developing power generation technology with numerous designs and materials being considered for the construction of fuel cells. One particular design, a multilayer, laminated fuel cell stack utilising a stabilised zirconia wafer as an electrolyte is under development by Ceramic Fuel Cells Ltd. The functional elements of the fuel cell also include the anode (a nickel/zirconia cermet), the cathode (a Sr doped LaMnO3), and an electrically conductive interconnect to allow multiple wafer stacks for the generation of usable voltages. In addition, the interconnects provide a heat sink (due to the exothermic nature of the fuel oxygen reaction) and a high thermal conductivity pathway for heat to be extracted from the fuel cell (for secondary power generation). The oxygen conductivity of the zirconia wafer requires that the fuel cell operates in the temperature range of 950-1000ºC.
The material requirements of the interconnect components are challenging. They must be resistant to oxidising and reducing gases at the operating temperature, have a reasonable thermal expansion match with the electrolyte/electrode wafer, be microstructurally stable over long periods at the fuel cell operating temperature, and be re-usable (for economic reasons) at the end of the fuel stack operating life. A number of metallic alloys have been considered for the role of interconnect for the fuel stack, these include: nickel-based alloys, high chromium alloys, iron-aluminium alloys and iron-chromium-aluminium alloys. After assessment of these alloys, an iron 20wt% chromium 5wt% aluminium alloy, with trace amounts of rare earth elements was deemed by Ceramic Fuel Cells Ltd to be the best potential as a candidate for the metallic components of the fuel cell. This alloy forms an aluminium oxide scale, resistant to both oxidising and reducing gases and has a reasonable thermal expansion match with the zirconia wafer over the operating temperature range of the fuel stack. Two forms of the alloy were examined, a 0.5mm thick sheet called Alfa IV and a 1mm sheet called NCA-S.
This thesis is concerned with the microstructural stability of the Alfa IV / NCA-S alloy as this was identified as being potentially detrimental to the economic and technical performance of the fuel cell stack. In particular, the low temperature (400-550ºC) decomposition of the alloy due to the miscibility gap in the iron chromium system was assessed as potentially damaging to the recyclability of the metallic components.
The decomposition of iron chromium alloys, due to the miscibility gap in the iron chromium system, has been the subject of considerable research. This is due, industrially, to the importance of these materials in numerous industries, such as the chemical and nuclear industries, and scientifically, as an ideal example of a miscibility gap in a binary metallic system. While the decomposition of…
Subjects/Keywords: aluminium; ferritic; spinodal; fuel cell
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APA (6th Edition):
Reid, M. H. (2012). Metal components of ceramic oxide fuel cells. (Doctoral Dissertation). University of Wollongong. Retrieved from 020499 Condensed Matter Physics not elsewhere classified, 091207 Metals and Alloy Materials ; https://ro.uow.edu.au/theses/3647
Chicago Manual of Style (16th Edition):
Reid, Mark H. “Metal components of ceramic oxide fuel cells.” 2012. Doctoral Dissertation, University of Wollongong. Accessed March 07, 2021.
020499 Condensed Matter Physics not elsewhere classified, 091207 Metals and Alloy Materials ; https://ro.uow.edu.au/theses/3647.
MLA Handbook (7th Edition):
Reid, Mark H. “Metal components of ceramic oxide fuel cells.” 2012. Web. 07 Mar 2021.
Vancouver:
Reid MH. Metal components of ceramic oxide fuel cells. [Internet] [Doctoral dissertation]. University of Wollongong; 2012. [cited 2021 Mar 07].
Available from: 020499 Condensed Matter Physics not elsewhere classified, 091207 Metals and Alloy Materials ; https://ro.uow.edu.au/theses/3647.
Council of Science Editors:
Reid MH. Metal components of ceramic oxide fuel cells. [Doctoral Dissertation]. University of Wollongong; 2012. Available from: 020499 Condensed Matter Physics not elsewhere classified, 091207 Metals and Alloy Materials ; https://ro.uow.edu.au/theses/3647
Delft University of Technology
20.
Cheung, Louis (author).
Fuel Cell Drone for Soil Monitoring.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:a191b5fc-4050-44b8-9652-4493d44b654c
► We have set out to develop a drone, based on the existing Delftacopter, capable of soil monitoring via LiDAR remote sensing. The battery was to…
(more)
▼ We have set out to develop a drone, based on the existing Delftacopter, capable of soil monitoring via LiDAR remote sensing. The battery was to be replaced by a
fuel cell system in order to extend the range threefold to 180km. Unfortunately, the ultimate design is likely unfeasible. Agriculture requires healthy soil and monitoring soil health is fundamental to its maintenance. Soil organic carbon in particular provides energy to the soil’s microorganisms, and is beneficial to water and nutrient retention. In addition, storing carbon in the soil is a form of carbon sequestration, which has become interesting due to the rising levels of carbon dioxide in our atmosphere. Monitoring soil organic carbon is therefore the goal of the drone design. The
fuel cell system is a 650Whydrogen
fuel cell by Intelligent Energy with a mass of 1290 g, which will be replacing the battery in the base design.
Fuel tanks that were considered suitable are the 450 g, 0.5 L, 500 bar and 1350 g, 3 L, 300 bar
fuel tanks by Meyer. It was found that one 1350 g and two 450 g
fuel tanks were necessary to achieve the desired range of 180 km. However, after more careful drag estimates, this configuration turns out to be too heavy. 4 450 g
fuel tanks remains feasible. Results below are based on this amount of
fuel tanks. The incorporated LiDAR sensor is one by Velodyne, namely the Puck LITE, with a specified range of 100 m. The LiDAR sensor has a firing cycle of 55.296 &s, almost 20 kHz. Based on previous studies that used LiDAR to measure soil organic carbon, it has been established that a density of 5 data points per square meter is required. Fromour LiDAR parameters it turns out that the optimal flight altitude is 27.5mabove the surface that is to be measured, with a rotation rate of 10 Hz for the LiDAR sensor, when flying at a speed of 20ms¡1. With a flight distance of roughly 116km at 22.5ms¡1 (111km at 20ms¡1), an area of 21.8km2 per flight can be scanned. 1
Advisors/Committee Members: Aravind, P.V. (mentor), Bhattacharya, Nandini (graduation committee), Remes, Bart (graduation committee), Tambi, Yash (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Fuel Cell Aircraft; LIDAR
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Manager
APA (6th Edition):
Cheung, L. (. (2020). Fuel Cell Drone for Soil Monitoring. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a191b5fc-4050-44b8-9652-4493d44b654c
Chicago Manual of Style (16th Edition):
Cheung, Louis (author). “Fuel Cell Drone for Soil Monitoring.” 2020. Masters Thesis, Delft University of Technology. Accessed March 07, 2021.
http://resolver.tudelft.nl/uuid:a191b5fc-4050-44b8-9652-4493d44b654c.
MLA Handbook (7th Edition):
Cheung, Louis (author). “Fuel Cell Drone for Soil Monitoring.” 2020. Web. 07 Mar 2021.
Vancouver:
Cheung L(. Fuel Cell Drone for Soil Monitoring. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 07].
Available from: http://resolver.tudelft.nl/uuid:a191b5fc-4050-44b8-9652-4493d44b654c.
Council of Science Editors:
Cheung L(. Fuel Cell Drone for Soil Monitoring. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:a191b5fc-4050-44b8-9652-4493d44b654c
University of Connecticut
21.
Preston, Joshua S.
Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media.
Degree: MS, Mechanical Engineering, 2011, University of Connecticut
URL: https://opencommons.uconn.edu/gs_theses/55
► Traditional methods for mathematical modeling of water transport in porous media lead to a sudden, sharp discontinuity in liquid saturation at the interface between…
(more)
▼ Traditional methods for mathematical modeling of water transport in porous media lead to a sudden, sharp discontinuity in liquid saturation at the interface between two porous media of different properties. The goal of this study was to determine if this discontinuity is a physical phenomenon that truly occurs or a mathematical anomaly that does not manifest physically at porous interfaces through which a non-wetting phase flows. The study uses mathematical models and experiments applied to water transport in the gas diffusion layer of polymer electrolyte
fuel cells (PEFCs).
Evidence of a region of gradual property change between the microporous layer and macroporous layer of bi-layer diffusion media is presented, and a mathematical model describing the effects of this gradual interfacial region is developed by adapting the methods used in the sudden interface model. The revised model results in a continuous liquid water saturation distribution across the diffusion media, compared to the sharp discontinuity in the liquid phase saturation predicted by the earlier sudden interface models, despite utilizing the same physical assumptions.
High resolution neutron radiography is used to measure the liquid content profile across the diffusion media, and the results are compared with the model predictions. When the instrumental broadening attributed to the limited resolution of the measurement is considered, the neutron radiography results are found to be similar to model predictions.
An additional neutron radiography experiment is conducted with a new, higher spatial resolution neutron detector. A PEFC is constructed with half of its active area supported by a diffusion media that features a microporous layer and half of its active area supported by a media without the microporous layer. By capturing images from these regions independently, effects of the microporous layer on the liquid water profile are able to be observed directly.
An argument based on the pore network model method is presented to elucidate the behavior of an interface between porous media at the pore scale, and this is shown to agree with the results of the macro-averaged model. It is determined that the discontinuity in liquid saturation that occurs in the model is a physical phenomenon when the media is considered at the macroscopic level in the case of an ideal interface, but it is unlikely that this discontinuity occurs in the porous media of the
fuel cell, due to the fact that a more gradual property change occurs in the material than originally anticipated.
Advisors/Committee Members: Jiong Tang, H. Russell Kunz, Ugur Pasaogullari.
Subjects/Keywords: Fuel Cell; capillary water transport
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Export
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APA (6th Edition):
Preston, J. S. (2011). Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/55
Chicago Manual of Style (16th Edition):
Preston, Joshua S. “Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media.” 2011. Masters Thesis, University of Connecticut. Accessed March 07, 2021.
https://opencommons.uconn.edu/gs_theses/55.
MLA Handbook (7th Edition):
Preston, Joshua S. “Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media.” 2011. Web. 07 Mar 2021.
Vancouver:
Preston JS. Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media. [Internet] [Masters thesis]. University of Connecticut; 2011. [cited 2021 Mar 07].
Available from: https://opencommons.uconn.edu/gs_theses/55.
Council of Science Editors:
Preston JS. Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media. [Masters Thesis]. University of Connecticut; 2011. Available from: https://opencommons.uconn.edu/gs_theses/55
Euskal Herriko Unibertsitatea / Universidad del País Vasco
22.
Pérez Manso, Angel.
Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
.
Degree: 2012, Euskal Herriko Unibertsitatea / Universidad del País Vasco
URL: http://hdl.handle.net/10810/9989
► Las pilas de combustible se presentan hoy día como una de las alternativas de generación de energía limpia más adecuadas. En este proyecto de tesis…
(more)
▼ Las pilas de combustible se presentan hoy día como una de las alternativas de generación de energía limpia más adecuadas. En este proyecto de tesis se presenta una visión global de lo que son, de cómo funcionan y de cuáles son las leyes que rigen este funcionamiento, centrándose en las denominadas pilas de combustible de tipo PEM.
Además de describir el modelo matemático utilizado para la simulación numérica, también se presenta un procedimiento optimizado para la simulación de prototipos de pila de combustible de tipo PEM.
Se incluye una recopilación de los resultados más importantes de los estudios realizados en los últimos años relacionados con la influencia de los diferentes parámetros geométricos de los canales de flujo en el rendimiento global de una pila de combustible de tipo PEM. Esta revisión se ha utilizado como base para un nuevo estudio: Análisis de la influencia de la configuración de la sección transversal del canal de flujo en el funcionamiento de una pila de combustible de tipo PEM con canales de flujo de tipo serpentín.
Finalmente, se realiza una propuesta de nueva geometría de canales de flujo que proporcione un rendimiento global óptimo al sistema a través de de la homogeneización de las condiciones de operación a lo largo de toda la superficie reactiva de la pila.
Advisors/Committee Members: Fernández Marzo, Florencio (advisor), Garmendia Mujika, Mikel (advisor).
Subjects/Keywords: fuel cell;
placas bipolares;
PEMFC
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Chicago ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pérez Manso, A. (2012). Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
. (Doctoral Dissertation). Euskal Herriko Unibertsitatea / Universidad del País Vasco. Retrieved from http://hdl.handle.net/10810/9989
Chicago Manual of Style (16th Edition):
Pérez Manso, Angel. “Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
.” 2012. Doctoral Dissertation, Euskal Herriko Unibertsitatea / Universidad del País Vasco. Accessed March 07, 2021.
http://hdl.handle.net/10810/9989.
MLA Handbook (7th Edition):
Pérez Manso, Angel. “Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
.” 2012. Web. 07 Mar 2021.
Vancouver:
Pérez Manso A. Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
. [Internet] [Doctoral dissertation]. Euskal Herriko Unibertsitatea / Universidad del País Vasco; 2012. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10810/9989.
Council of Science Editors:
Pérez Manso A. Influencia del diseño de los canales de flujo en el rendimiento de una pila de combustible de membrana de intercambio protónico (PEMFC)
. [Doctoral Dissertation]. Euskal Herriko Unibertsitatea / Universidad del País Vasco; 2012. Available from: http://hdl.handle.net/10810/9989
University of Toronto
23.
Ke, Ji.
Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs.
Degree: 2010, University of Toronto
URL: http://hdl.handle.net/1807/25723
► Biology is a good source of analogies for engineering design. One approach of retrieving biological analogies is to perform keyword searches on natural-language sources such…
(more)
▼ Biology is a good source of analogies for engineering design. One approach of retrieving biological analogies is to perform keyword searches on natural-language sources such as books, journals, etc. A challenge in retrieving information from natural-language sources is the potential requirement to process a large number of search results. This thesis describes two methods on improving the relevancy of the search results. The first method is inserting metadata such as part- of-speech, word sense and lexicographical data for each word in a natural-language. The second method is categorizing the search results, using WordNet relationships and Wikipedia structures as ontologies. Although this research is still exploratory, initial qualitative observations demonstrate successful identification and separation of biological phenomena relevant to either desired functions or desired qualities. The benefits of embedding metadata are demonstrated through a case study on the redesign of a fuel cell bipolar plate. A prototype was constructed with ability to passively prevent prolonged catastrophic flooding.
MAST
Advisors/Committee Members: Shu, Lily H., Wallace, James S., Mechanical and Industrial Engineering.
Subjects/Keywords: Biomimetic; Fuel Cell; 0548
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APA (6th Edition):
Ke, J. (2010). Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/25723
Chicago Manual of Style (16th Edition):
Ke, Ji. “Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs.” 2010. Masters Thesis, University of Toronto. Accessed March 07, 2021.
http://hdl.handle.net/1807/25723.
MLA Handbook (7th Edition):
Ke, Ji. “Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs.” 2010. Web. 07 Mar 2021.
Vancouver:
Ke J. Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1807/25723.
Council of Science Editors:
Ke J. Supporting Biomimetic Design by Categorizing Search Results and Sense Disambiguation, with Case Studies on Fuel Cell Water Management Designs. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/25723
KTH
24.
Ureña, Pedro Manuel Camacho.
Integration of ASOFC with Gasification for Polygeneration.
Degree: Heat and Power Technology, 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-135970
► Solid Oxide fuel cells (SOFC), is one of the fuel cell types with a greater potential as a commercial electrical power generator. As a…
(more)
▼ Solid Oxide fuel cells (SOFC), is one of the fuel cell types with a greater potential as a commercial electrical power generator. As a high temperature fuel cell type (600-1000ºC), presents one of the biggest opportunity to be integrated in a polygeneration system combining it with existing infrastructure to provide heat and power in a efficient way. Furthermore, unlike other types of fuel cells, SOFC can work using a wide variety of fuels, meaning that with some reformation; most of the commercially available fuels can be utilized, and even some relatively sustainable fuels that are not yet commercial, such as gasified biomass. The main part of this thesis focuses on the design of two gasifier models, one for partial oxidation gasification and other for steam gasification, both models where verified using published experimental results and simulations. Afterwards the models were integrated to work with a SOFC system. Several key parameters where analyzed in other have a complete view of the behavior of the system. The system was studied by changing different parameters like fuel cell operating temperature, fuel cell operating pressure, fuel composition, and moisture content. Finally another part of the thesis is to analyze two different systems, one integrating gasifier and SOFC, and other studying the integration of the gasifier system to a combine cycle system, SOFC-Micro Gas Turbine. The study concludes, as expected, that there is an inverse correlation between the moisture level in the fuel and the efficiencies in all the systems. Also the model shows that increasing the cell operating temperature will reduce the number of cell needed in order to achieve the design power output.
Subjects/Keywords: Polygeneration; Fuel Cell; Gasification
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APA (6th Edition):
Ureña, P. M. C. (2012). Integration of ASOFC with Gasification for Polygeneration. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-135970
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ureña, Pedro Manuel Camacho. “Integration of ASOFC with Gasification for Polygeneration.” 2012. Thesis, KTH. Accessed March 07, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-135970.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ureña, Pedro Manuel Camacho. “Integration of ASOFC with Gasification for Polygeneration.” 2012. Web. 07 Mar 2021.
Vancouver:
Ureña PMC. Integration of ASOFC with Gasification for Polygeneration. [Internet] [Thesis]. KTH; 2012. [cited 2021 Mar 07].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-135970.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ureña PMC. Integration of ASOFC with Gasification for Polygeneration. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-135970
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
25.
Brushett, Fikile R.
Microfluidic platforms for the investigation of fuel cell catalysts and electrodes.
Degree: PhD, 0300, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/18571
► A clear need exists for novel approaches to producing and utilizing energy in more efficient ways, in light of society’s ever increasing demand as well…
(more)
▼ A clear need exists for novel approaches to producing and utilizing energy in more efficient ways, in light of society’s ever increasing demand as well as growing concerns with respect to climate change related to CO2 emissions. The development of low temperature
fuel cell technologies will continue to play an important role in many alternative energy conversion strategies, especially for portable electronics and automotive applications. However, widespread commercialization of
fuel cell technologies has yet to be achieved due to a combination of high costs, poor durability and, system performance limitations (Chapter 1). Developing a better understanding of the complex interplay of electrochemical, transport, and degradation processes that govern the performance and durability of novel
fuel cell components, particularly catalysts and electrodes, within operating
fuel cells is critical to designing robust, inexpensive configurations that are required for commercial introduction. Such detailed in-situ investigations of individual electrode processes are complicated by other factors such as water management, uneven performance across electrodes, and temperature gradients. Indeed, too many processes are interdependent on the same few variable parameters, necessitating the development of novel analytical platforms with more degrees of freedom.
Previously, membraneless microfluidic
fuel cells have been developed to address some of the aforementioned
fuel cell challenges (Chapter 2). At the microscale, the laminar nature of fluid flow eliminates the need for a physical barrier, such as a stationary membrane, while still allowing ionic transport between electrodes. This enables the development of many unique and innovative
fuel cell designs. In addition to addressing water management and
fuel crossover issues, these laminar flow-based systems allow for the independent specification of individual stream compositions (e.g., pH). Furthermore, the use of a liquid electrolyte enables the simple in-situ analysis of individual electrode performance using an off-the-shelf reference electrode. These advantages can be leveraged to develop microfluidic
fuel cells as versatile electro-analytical platforms for the characterization and optimization of catalysts and electrodes for both membrane- and membraneless
fuel cells applications. To this end, a microfluidic hydrogen-oxygen (H2/O2)
fuel cell has been developed which utilizes a flowing liquid electrolyte instead of a stationary polymeric membrane. For analytical investigations, the flowing stream (i) enables autonomous control over electrolyte parameters (i.e., pH, composition) and consequently the local electrode environments, as well as (ii) allows for the independent in-situ analyses of catalyst and/or electrode performance and degradation characteristics via an external reference electrode (e.g., Ag/AgCl). Thus, this microfluidic analytical platform enables a high number of experimental degrees of freedom, previously limited to a three-electrode electrochemical…
Advisors/Committee Members: Kenis, Paul J.A. (advisor), Kenis, Paul J.A. (Committee Chair), Masel, Richard I. (committee member), Wieckowski, Andrzej (committee member), Seebauer, Edmund G. (committee member).
Subjects/Keywords: microfluidic fuel cell; membraneless fuel cell; electrode analysis; alkaline fuel cell; catalyst development; microtomography; direct methanol fuel cell
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APA (6th Edition):
Brushett, F. R. (2011). Microfluidic platforms for the investigation of fuel cell catalysts and electrodes. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18571
Chicago Manual of Style (16th Edition):
Brushett, Fikile R. “Microfluidic platforms for the investigation of fuel cell catalysts and electrodes.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 07, 2021.
http://hdl.handle.net/2142/18571.
MLA Handbook (7th Edition):
Brushett, Fikile R. “Microfluidic platforms for the investigation of fuel cell catalysts and electrodes.” 2011. Web. 07 Mar 2021.
Vancouver:
Brushett FR. Microfluidic platforms for the investigation of fuel cell catalysts and electrodes. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2142/18571.
Council of Science Editors:
Brushett FR. Microfluidic platforms for the investigation of fuel cell catalysts and electrodes. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18571
University of Ontario Institute of Technology
26.
Allan, Jesse.
The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance.
Degree: 2016, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/658
► Fuel cell based breath alcohol sensors (BrASs) are one of the most important tools used by law enforcement today. While these devices are used globally,…
(more)
▼ Fuel cell based breath alcohol sensors (BrASs) are one of the most important tools used by law enforcement today. While these devices are used globally, they all suffer from a common deficiency: reliance on water. The ability of the
fuel cell sensor to manage water content is one of the greatest fundamental challenges facing this technology today.
A next-generation
fuel cell was designed specifically for sensor testing along with a test station that allowed for rapid response and sensor characteristics of a given material. The in-house design was validated against a commercial
cell to provide feedback on how materials in the in-house
cell would behave in a commercial designed unit. The results showed that our
cell with a commercial membrane electrode assembly (MEA) behaved identically to a commercial
cell with the same MEA.
Membranes were for their role in senor performance. Membranes for power generation, such as Nafion, were investigated and while they showed good performance in high humidity, performance suffered in low humidity. This is due to the thin characteristics of the material. Poly-vinyl chloride (PVC) membranes showed improved performance over Nafion, while composites of PVC and sulfonated silica showed performance that matched that of the commercial PVC, whilst using significantly less water.
Finally, the catalyst layer and gas diffusion layer (GDL) were investigated. For the catalyst layer, platinum black and 20% platinum supported on carbon achieved similar results. The choice of catalyst was less of an issue than the choice of GDL. It was found that using carbon fiber paper GDLs lead to greater retention of water in the MEA compared to carbon cloth GDLs due to the lower air permeability. This came at a cost however in that with a lower air permeability, less ethanol vapour would reach the catalytic sites, reducing sensing performance.
Advisors/Committee Members: Easton, E. Bradley.
Subjects/Keywords: Fuel cell; Sensor; Ethanol; Electrochemistry
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APA (6th Edition):
Allan, J. (2016). The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/658
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Allan, Jesse. “The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance.” 2016. Thesis, University of Ontario Institute of Technology. Accessed March 07, 2021.
http://hdl.handle.net/10155/658.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Allan, Jesse. “The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance.” 2016. Web. 07 Mar 2021.
Vancouver:
Allan J. The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance. [Internet] [Thesis]. University of Ontario Institute of Technology; 2016. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10155/658.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Allan J. The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance. [Thesis]. University of Ontario Institute of Technology; 2016. Available from: http://hdl.handle.net/10155/658
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii – Manoa
27.
Legarra Arizaleta, Maider.
Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/100986
► M.S. University of Hawaii at Manoa 2012.
The research in this thesis was performed at the Hawaii Natural Energy Institute based at the University of…
(more)
▼ M.S. University of Hawaii at Manoa 2012.
The research in this thesis was performed at the Hawaii Natural Energy Institute based at the University of Hawaii at Manoa; two principal foci were addressed: (1) to design and investigate the performance of an aqueous-alkaline biocarbon fuel cell that generates power at temperatures ~500 K, (2) to determine the electrolyte chemistry at conditions similar to those of the fuel cell. Our Lab has been working in the first focus, the design of an aqueous-alkaline biocarbon fuel cell, since 2000. In 2007 T. Nunoura et al. [12] published the first paper in this topic. They studied the thermodynamics of the anode and cathode reactions and showed the experimental results of a firstgeneration, aqueous-alkaline biocarbon fuel cell built in the Lab. They showed that an aqueous-alkaline fuel cell operating at 518 K and 35.8 bar was able to realize an open-circuit voltage of 0.57 V, a short circuit current density of 43.6 mA/cm2 and a maximum power of 19 mW, using a 6M KOH/ 1 M LiOH mixed electrolyte with a catalytic silver screen/platinum foil cathode and an anode composed of 0.5 g of compacted corncob charcoal previously carbonized at 950°C. A second paper published by M. Antal and G. Nihous [13] proved that the reactions of a moderate temperature aqueous-alkaline biocarbon fuel cell may be favored at temperatures as high as 300 °C and the carbonate electrolyte may be as effective as the hydroxide electrolyte. Based on these promising findings, the work in the biocarbon fuel cell continued. Different fuel cells were designed and built to overcome the problems that arose. The fuel cell working with high concentrations of potassium carbonate solution as electrolyte showed the best performance. However, unexpected crystals determined by TG-MS as potassium bicarbonate appeared in this fuel cell that caused our research focus to take another direction: The study of the electrolyte. We decided to focus on the carbonate/bicarbonate chemistry and the understanding of the formation of these potassium bicarbonate crystals. To study the formation of the crystals, a "tubing bomb" that can stand pressures as high as 2000 psi and can be quickly heated in a sand bath was built. Previous literature [14] indicates the decomposition of dry bicarbonate into carbonate and CO2. This research focuses on the thermodynamics of this decomposition reaction in solution at conditions close to the fuel cell conditions. By determining the equilibrium constant, the thermodynamic properties (enthalpy, entropy and Gibbs free energy) of the bicarbonate decomposition reaction and the temperature at which the potassium bicarbonate in solution will completely decompose, we can determine the allowable operation temperature for the fuel cell.
Subjects/Keywords: carbon fuel cell electrolyte
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APA (6th Edition):
Legarra Arizaleta, M. (2016). Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/100986
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Legarra Arizaleta, Maider. “Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions.” 2016. Thesis, University of Hawaii – Manoa. Accessed March 07, 2021.
http://hdl.handle.net/10125/100986.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Legarra Arizaleta, Maider. “Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions.” 2016. Web. 07 Mar 2021.
Vancouver:
Legarra Arizaleta M. Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10125/100986.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Legarra Arizaleta M. Study of the chemistry of the carbon fuel cell electrolyte at near critical conditions. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/100986
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
28.
Thorne, Michelle I.
A Fuel-Cell Vehicle Test Station.
Degree: 2008, University of Waterloo
URL: http://hdl.handle.net/10012/3733
► Due to concerns about energy security, rising oil prices, and adverse effects of internal combustion engine vehicles on the environment, the automotive industry is quickly…
(more)
▼ Due to concerns about energy security, rising oil prices, and adverse effects of internal combustion engine vehicles on the environment, the automotive industry is quickly moving towards developing efficient “green” vehicles. Fuel cell-powered vehicles offer high efficiency and practically zero emissions. The main obstacles for widespread commercial production of fuel cell vehicles are high cost and short lifetime of fuel cell stacks, lack of a hydrogen infrastructure, and generation of hydrogen in an environmentally-friendly manner and its storage. Using actual fuel cells and actual vehicular loads in the study of fuel cell vehicular systems can be prohibitive due to cost (initial and running) and safety issues. It is very desirable to have a test station that emulates a vehicle with a high degree of accuracy and flexibility to alleviate cost and safety issues.
This thesis proposes a design for a test station that emulates the drive train of a typical fuel cell-powered vehicle that is equipped with regenerative braking capability. As part of the test station, a fuel cell emulator is designed and validated through simulation based on the Nexa Fuel Cell power module manufactured by Ballard Power Systems.
As another building block for the test station, a bi-directional controllable DC load is developed that can realize a given drive cycle for the scaled-down version of a given vehicle. The load allows simulation of regenerative braking capability. The performance of the load is validated through simulation.
A DC-DC boost converter for controlling the fuel cell power, as well as an energy storage system for assisting the fuel cell in providing the required power during high-demand periods, are incorporated into the proposed test station. Simulation results are used to show that the test station is capable of simulating the real-life conditions experienced by actual fuel cell vehicles on the road. The test station, when realized by hardware, can be used for performing a wide range of studies on the drive train architecture and power management of fuel cell vehicles.
Subjects/Keywords: Fuel Cell
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APA (6th Edition):
Thorne, M. I. (2008). A Fuel-Cell Vehicle Test Station. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/3733
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Thorne, Michelle I. “A Fuel-Cell Vehicle Test Station.” 2008. Thesis, University of Waterloo. Accessed March 07, 2021.
http://hdl.handle.net/10012/3733.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Thorne, Michelle I. “A Fuel-Cell Vehicle Test Station.” 2008. Web. 07 Mar 2021.
Vancouver:
Thorne MI. A Fuel-Cell Vehicle Test Station. [Internet] [Thesis]. University of Waterloo; 2008. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10012/3733.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Thorne MI. A Fuel-Cell Vehicle Test Station. [Thesis]. University of Waterloo; 2008. Available from: http://hdl.handle.net/10012/3733
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
29.
Dong, Gregory.
Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell.
Degree: 2009, University of Waterloo
URL: http://hdl.handle.net/10012/4867
► The microbial fuel cell (MFC) is an innovative renewable energy technology that also serves to treat wastewater through the bacteria-driven oxidation of organic substrates. The…
(more)
▼ The microbial fuel cell (MFC) is an innovative renewable energy technology that also serves to treat wastewater through the bacteria-driven oxidation of organic substrates. The liquid anolyte contains the organic substrate to be oxidized, while the catholyte contains the substance to be reduced. In a dual-chamber MFC, the catholyte typically contains dissolved oxygen or another easily reducible compound (e.g., ferricyanide) in an aqueous solution, while in a single-chamber MFC, gaseous airborne oxygen reacts directly at the cathode.
A single-chamber air-cathode microbial fuel cell was operated using an acetate substrate and a 0.2 mg/cm2 platinum catalyst cathode in the initial stages of the project. The platinum catalyst was airbrushed onto a carbon paper cathode and hot-pressed onto a Nafion 117 membrane. After the platinum runs were completed, the MFC was disassembled, cleaned and reassembled with a new non-precious nitrogen-doped carbon composite catalyst replacing the platinum. Two MFCs were operated at different loading levels (1.0 mg/cm2 and 2.0 mg/cm2) of the new catalyst. The cell was configured to operate in a fed-batch and upflow modes.
Preliminary experiments were conducted using two non-precious catalysts synthesized with different nitrogen precursors, polyaniline and ethylenediamine (EDA). These experiments showed the ethylenediamine-based-catalyst exhibited higher catalytic activity for oxygen reduction (ORR) with a half-wave potential of 0.57 V versus 0.43 V for the polyaniline catalyst. These values were lower than the expected half-wave potential of 0.65 – 0.70 V. Consequently, the catalyst based on EDA was used in all subsequent experiments. SEM images revealed that this catalyst has a fluffy, bulbous, highly porous structure, while EDAX and XRD both detected the presence of residual iron and cobalt from the preparation procedure. Nitrogen (3.57 wt %) and oxygen (4.87 wt %) were also detected from the EDAX analysis.
Operation with a hydraulic residence time (HRT) of 24 hours and feed COD concentration of 6.44 g COD/L-day was found to produce the highest power density of 141.7 ± 2.4 mW/m2 from the experiments conducted on the platinum catalyst. A subsequent run at a 12 hour HRT and 3.22 g COD/L-day feed produced only 104.4 ± 5.2 mW/m2. When the cell operation was reverted to the original high HRT and high feed COD concentration, the original current was not recovered and in fact remained virtually unchanged from the level attained at the lower HRT and COD feed level (105.7 ± 2.7 mW/m2). It was suspected that the decreased acetate concentration in the second phase, and the biomass accumulation in the replicate third phase were the cause of the decreased currents. Overall, the COD removal in each phase was high, between 87 – 95% although only a maximum of 4.24% was due to electricity generation. A significant portion of the COD removal during operation at high HRT and feed concentration was due to methane generation (30-50%), while the effect of oxygen leakage from the cathode…
Subjects/Keywords: fuel cell
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APA (6th Edition):
Dong, G. (2009). Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/4867
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dong, Gregory. “Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell.” 2009. Thesis, University of Waterloo. Accessed March 07, 2021.
http://hdl.handle.net/10012/4867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dong, Gregory. “Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell.” 2009. Web. 07 Mar 2021.
Vancouver:
Dong G. Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell. [Internet] [Thesis]. University of Waterloo; 2009. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10012/4867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dong G. Effect of Substrate Concentration and Loading and Catalyst Type on the Performance of a Microbial Fuel Cell. [Thesis]. University of Waterloo; 2009. Available from: http://hdl.handle.net/10012/4867
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
30.
Higgins, Drew Christopher.
Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells.
Degree: 2011, University of Waterloo
URL: http://hdl.handle.net/10012/5915
► The extensive amount of platinum required in order to facilitate the oxygen reduction reaction (ORR) occuring at the cathode of low temperature fuel cells provides…
(more)
▼ The extensive amount of platinum required in order to facilitate the oxygen reduction reaction (ORR) occuring at the cathode of low temperature fuel cells provides cost limitations to the sustainable commercialization of this technology. The development of electrocatalyst materials with either reduced or eliminated platinum dependency is an urgent necessity. The present work investigates the application of nitrogen doped carbon nanotubes (N-CNTs) and their composites as electrocatalyst materials for the ORR. First, N-CNTs are investigated as platinum support materials for proton exchange membrane fuel cells. They were found to result in improved ORR activity in comparison with undoped CNT supported platinum, due to the enhanced catalyst-support interactions and electronic properties induced by nitrogen heteroatoms incorporated into the graphitic structure of CNTs. Second, N-CNTs synthesized from a variety of different precursor materials were investigated as ORR electrocatalysts in alkaline conditions. The influence of the precursor materials was illustrated with improved ORR activity and nitrogen concentration observed for N-CNTs synthesized with precursor materials containing higher nitrogen to carbon contents. Highly active N-CNTs based on ethylenediamine were fabricated into thin, free standing films for use as a stand-alone cathode catalyst layer in an alkaline anion exchange membrane fuel cell. Finally, metal-free N-CNTs were developed and demonstrated to provide promising ORR in the absence of any metal interactions.
Subjects/Keywords: fuel cell; oxygen reduction
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APA (6th Edition):
Higgins, D. C. (2011). Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Higgins, Drew Christopher. “Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells.” 2011. Thesis, University of Waterloo. Accessed March 07, 2021.
http://hdl.handle.net/10012/5915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Higgins, Drew Christopher. “Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells.” 2011. Web. 07 Mar 2021.
Vancouver:
Higgins DC. Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10012/5915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Higgins DC. Nitrogen-Doped Carbon Nanotubes and their Composites as Oxygen Reduction Reaction Electrocatalysts for Low Temperature Fuel Cells. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/5915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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