To alloy or not to alloy? Cr modified Pt/C cathode catalysts for PEM fuel cells
Wells, Peter P., Qian, Yangdong, King, Colin R., Wiltshire, Richard J.K., Crabb, Eleanor M., Smart, Lesley E., Thompsett, David and Russell, Andrea E. (2008) To alloy or not to alloy? Cr modified Pt/C cathode catalysts for PEM fuel cells. Faraday Discussions, 138, (1), 273-285. (doi:10.1039/b707353b).
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The cathode electrocatalysts for proton exchange membrane (PEM) fuel cells are commonly platinum and platinum based alloy nanoparticles dispersed on a carbon support. Control over the particle size and composition has, historically, been attained empirically, making systematic studies of the effects of various structural parameters difficult. The controlled surface modification methodology used in this work has enabled the controlled modification of carbon supported Pt nanoparticles by Cr so as to yield nanoalloy particles with defined compositions. Subsequent heat treatment in 5% H2 in N2 resulted in the formation of a distinct Pt3Cr alloy phase which was either restricted to the surface of the particles or present throughout the bulk of the particle structure. Measurement of the oxygen reduction activity of the catalysts was accomplished using the rotating thin film electrode method and the activities obtained were related to the structure of the nanoalloy catalyst particles, largely determined using Cr K edge and Pt L3 edge XAS.
|Keywords:||fe, oxygen reduction, k-edge, electronic-structure, properties, electrocatalytic, platinum, surface-composition, edge spectra, co, absorption fine-structure|
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||19 Aug 2008|
|Last Modified:||02 Mar 2012 13:53|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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