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Tartu University

1. Hussain, Sajid. Electrochemical reduction of oxygen on supported Pt catalysts .

Degree: 2019, Tartu University

Selle töö eesmärk oli parendada süsinikule seondatud plaatinakatalüsaatorite aktiivsust ja eluiga hapniku elektrokeemilisel redutseerumisel madalatemperatuursetes kütuseelementides. Töös kasutati erinevaid meetodeid Pt nanoosakeste valmistamiseks: magnetrontolmustamist, elektrokeemilist sadestamist, keemilist sünteesi ja fotokeemilist sünteesi. Pinnaanalüüsiks kasutati skaneerivat ja läbistuselektronmikroskoopiat, röntgenfotoelektronspektroskoopiat, röntgendifraktsioonanalüüsi, tsüklilist voltamperomeetriat ja adsorbeerunud CO elektrokeemilist oksüdeerimist. Hapniku elektroredutseerumise kineetikat uuriti põhjalikult pöörleva ketaselektroodi meetodil. Töö esimeses osas sadestati plaatina nanoosakesed süsinikul põhinevatele materjalidele nagu mitmeseinalised süsiniknanotorud ja grafeeni nanoliistakud ja uuriti nende elektrokatalüütilist aktiivsust nii aluselises kui ka happelises lahuses. Töö teises osas keskenduti Pt nanoosakestele, mis olid seondatud metallioksiidide (TiO2 või SnO2) ja süsinikmaterjalide komposiitidele eesmärgiga parandada katalüsaatori stabiilsust ja aktiivsust hapniku redutseerumisel. Põhjaliku testimise tulemused näitasid, et metallioksiidid tõstavad märgatavalt elektrokatalüütilist aktiivsust ja pikaaegset stabiilsust tugeva metall-katalüsaatorikandja vastastiktoime tõttu. Kõik selles töös uuritud materjalid näitasid märkimisväärset aktiivsust hapniku redutseerumisel ja paremat stabiilsust võrreldes kommertsiaalse 20% Pt/C katalüsaatoriga.; The aim of this study is to improve the electrocatalytic activity and lifetime of the platinum catalyst supported on carbon-based materials for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. Various methods were employed for the deposition of platinum nanoparticles on the support such as magnetron sputtering, electrochemical deposition, chemical synthesis and photo-deposition. Surface characterisation of the prepared electrocatalysts was performed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) analysis, cyclic voltammetry and CO stripping experiments. The kinetics of the ORR has been thoroughly studied employing the rotating disk electrode (RDE) method. In the first part of the PhD studies, platinum nanoparticles were deposited on carbon-based support materials such as multi-walled carbon nanotubes and modified graphene nanosheets, the electrochemical measurements were carried out in both alkaline and acidic solutions. The second part of the research was devoted to investigate the activity and durability of platinum nanoparticles supported on metal oxide-carbon composites. Electrochemical results revealed that incorporating metal oxide (TiO2 or SnO2) into the carbon-based support materials increases the electrocatalytic activity and durability of the catalysts by the strong metal-support interaction. All the different types of electrocatalysts prepared and investigated in this work showed remarkable ORR activity and better long-term… Advisors/Committee Members: Tammeveski, Kaido, juhendaja (advisor), Kongi, Nadezda, juhendaja (advisor), Erikson, Heiki, juhendaja (advisor).

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APA (6th Edition):

Hussain, S. (2019). Electrochemical reduction of oxygen on supported Pt catalysts . (Thesis). Tartu University. Retrieved from http://hdl.handle.net/10062/64847

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):

Hussain, Sajid. “Electrochemical reduction of oxygen on supported Pt catalysts .” 2019. Thesis, Tartu University. Accessed August 24, 2019. http://hdl.handle.net/10062/64847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Hussain, Sajid. “Electrochemical reduction of oxygen on supported Pt catalysts .” 2019. Web. 24 Aug 2019.

Vancouver:

Hussain S. Electrochemical reduction of oxygen on supported Pt catalysts . [Internet] [Thesis]. Tartu University; 2019. [cited 2019 Aug 24]. Available from: http://hdl.handle.net/10062/64847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hussain S. Electrochemical reduction of oxygen on supported Pt catalysts . [Thesis]. Tartu University; 2019. Available from: http://hdl.handle.net/10062/64847

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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