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dc.contributor.advisorLandsberger, Sheldon
dc.contributor.advisorManthiram, Arumugam
dc.creatorHarrison, Richard K.
dc.date.accessioned2017-02-24T17:17:19Z
dc.date.available2017-02-24T17:17:19Z
dc.date.issued2007-05
dc.identifierdoi:10.15781/T20G3H36G
dc.identifier.urihttp://hdl.handle.net/2152/45778
dc.description.abstractThe Palladium--Cobalt alloy system was studied for potential Proton Exchange Membrane Fuel Cell catalyst applications. The focus of this study was the determination of the effects of boron content on the structure and electrochemical behavior of Pd--Co alloys. Boron is taken up by the alloy system during the borohydride reduction of the catalyst to nanoparticle size. The boron contents of the catalysts were determined using Prompt Gamma Activation Analysis, while alloy structure and electrochemical behavior were determined using X--Ray Diffraction (XRD) and Cyclic Voltammetry (CV), respectively. Alloys were tested at three heat treatment levels: as--prepared, 500 °C and 900 °C. The as--prepared samples retained the greatest amount of boron, but the samples heat treated at 500 °C revealed minimal losses in the boron content. A significant change in the boron content was only observed for samples heat treated at 900 °C. A comparison of the prepared alloys showed that the boron content increased with increasing cobalt content of the alloy for the alloys and heat treatments tested. Several other preparation methods were also tested for effects on catalyst properties. The XRD measurements showed substantial alloy formation and particle growth with increasing heat treatment temperature. CV measurements revealed the best performance for the Oxygen Reduction Reaction (ORR) in the as--prepared samples. The catalyst prepared with the reverse microemulsion method also showed increased reaction kinetics over catalysts prepared by the conventional borohydride reduction. These facts led to the conclusion that particle size has a dominant effect over boron content for ORR catalyst activity.en_US
dc.format.mediumelectronicen_US
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.subjectPalladium-Cobalt alloy systemen_US
dc.subjectProton Exchange Membrane Fuel catalysten_US
dc.subjectBoronen_US
dc.titleDetermination of boron in fuel cell catalysts using prompt gamma activation analysisen_US
dc.typeThesisen_US
dc.description.departmentMechanical Engineeringen_US
dc.type.genreThesisen_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineMechanical Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
dc.rights.restrictionRestricteden_US


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