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You searched for +publisher:"Clemson University" +contributor:("Dr. Terry Tritt"). Showing records 1 – 2 of 2 total matches.

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1. Lahwal, Ali Sadek. Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor.

Degree: PhD, Physics, 2015, Clemson University

The imminent oil crisis and global warming has revived research on sustainable energy resources. The researchers are seeking for alternative, clean, cheap, and safe resources of energy, such as solar energy, wind, sea waves, and heat. To this end thermoelectric materials are of technological interest owing to their ability of direct thermal-to-electrical energy conversion. In thermoelectricity, thermal gradients can be used to generate an electrical power output. Recent efforts in thermoelectrics are focused on developing higher efficient power generation materials. These materials can open many new horizons of applications, such as converting solar thermal energy to electricity, waste heat recovery, and as power generators for deep space exploration of our solar system when coupled with a radioactive heat source. In this dissertation, the overall goal is to investigate both the n-type and p-type of the state of the art thermoelectric material, silicon germanium (SiGe), for high temperature power generation. Further improvement of thermoelectric performance of Si-Ge alloys hinges upon how to significantly reduce the as yet large lattice thermal conductivity, and optimizing the thermoelectric power factor PF. Advisors/Committee Members: Dr. Terry Tritt, Dr. Jian He, Dr. Apparao Rao, Dr. Catalina Marinescu.

Subjects/Keywords: Model; NaBH4; Thermoelectrics; YSZ

…acknowledge all the professors at Physics and astronomy department at Clemson University who taught… …Peter Barnes first person I met with at Clemson University when he was the chair of physics… …department, he hosted me and accepted me as graduate student at Clemson University. Dr. Mark… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lahwal, A. S. (2015). Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1482

Chicago Manual of Style (16th Edition):

Lahwal, Ali Sadek. “Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor.” 2015. Doctoral Dissertation, Clemson University. Accessed December 04, 2020. https://tigerprints.clemson.edu/all_dissertations/1482.

MLA Handbook (7th Edition):

Lahwal, Ali Sadek. “Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor.” 2015. Web. 04 Dec 2020.

Vancouver:

Lahwal AS. Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor. [Internet] [Doctoral dissertation]. Clemson University; 2015. [cited 2020 Dec 04]. Available from: https://tigerprints.clemson.edu/all_dissertations/1482.

Council of Science Editors:

Lahwal AS. Thermoelectric Properties of Silicon Germanium: An Investigation of the Reduction of Lattice Thermal Conductivity and Enhancement of Power Factor. [Doctoral Dissertation]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_dissertations/1482

2. Childress, Anthony. Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices.

Degree: PhD, Physics and Astronomy, 2018, Clemson University

Since their inception, carbon nanomaterials have been exploited for use in energy storage. The discovery of carbon nanotubes and the later isolation of graphene opened new avenues in electrode research for batteries and electric double layer capacitors (EDLCs). Their combination of flexibility, mechanical robustness, and electronic conductivity make them ideal for use as active materials and additives. My research has focused on the synthesis and implementation of helical carbon nanotubes (HCNTs) for supercapacitors and few-layer graphene in the form of graphene foam (GF) for aluminum-ion batteries. The presence of defects and dopants was controlled in each system to determine how they relate to the performance of the electrode materials. For each material, Raman spectroscopy served as a key analytical tool. Over the past two decades, the Raman modes of carbon nanotubes and graphene have been well characterized and their relation to various aspects of the graphitic lattice such as defect density, dopant type, and lattice constants have been determined. I used these characteristics to correlate material properties to electrode performance. In the first chapter, I give an overview of the properties and energy storage applications of graphene and carbon nanotubes. The second chapter concerns the basic information needed to understand the electrochemical and spectroscopic methods used to analyze the samples, as well as the instrumentation and equipment used for measurements. In the third chapter, I discuss graphene foam cathodes as used in aluminum-ion batteries. For the graphene foam studies, the methods of producing the foams and Al-ion battery components were optimized before beginning electrochemical characterization, and are described in section 3.1.2. The intercalation process of the chloroaluminate anions was studied by in situ Raman spectroscopy applied to charge/discharge cycling of the cells. The role of surface defects and nitrogen dopants in the performance of few-layer graphene was studied using this method and correlated to performance using several electrochemical techniques. The fourth and final chapter details my work with HCNTs. I first synthesized them using chemical vapor deposition methods which are commensurate with scalable processing, as described in section 4.2. They were prepared for electrochemical testing in two forms: vertically aligned arrays of various heights on metal substrates and freestanding entangled carpets known as buckypapers. They were then characterized spectroscopically and electrochemically and found to possess superior performance to that of linear carbon nanotube analogues. The HCNT buckypapers were also found to be superior scaffolds for polymer composites by virtue of retaining a greater mass loading of polymer, leading to improved capacitance. Advisors/Committee Members: Dr. Apparao M. Rao, Committee, Chair Dr. Ramakrishna Podila, Dr. George Chumanov, Dr. Terry Tritt.

Subjects/Keywords: batteries; carbon nanotubes; electrochemistry; graphene; Raman spectroscopy; supercapacitors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Childress, A. (2018). Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2159

Chicago Manual of Style (16th Edition):

Childress, Anthony. “Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices.” 2018. Doctoral Dissertation, Clemson University. Accessed December 04, 2020. https://tigerprints.clemson.edu/all_dissertations/2159.

MLA Handbook (7th Edition):

Childress, Anthony. “Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices.” 2018. Web. 04 Dec 2020.

Vancouver:

Childress A. Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices. [Internet] [Doctoral dissertation]. Clemson University; 2018. [cited 2020 Dec 04]. Available from: https://tigerprints.clemson.edu/all_dissertations/2159.

Council of Science Editors:

Childress A. Graphene Foam and Helically Coiled Carbon Nanotubes as Electrodes in Energy Storage Devices. [Doctoral Dissertation]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_dissertations/2159

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