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To alloy or not to alloy? Cr modified Pt/C cathode catalysts for PEM fuel cells

Record type: Article

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.

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Citation

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), pp. 273-285. (doi:10.1039/b707353b).

More information

Published date: 2008
Keywords: fe, oxygen reduction, k-edge, electronic-structure, properties, electrocatalytic, platinum, surface-composition, edge spectra, co, absorption fine-structure

Identifiers

Local EPrints ID: 54511
URI: http://eprints.soton.ac.uk/id/eprint/54511
ISSN: 0301-7249
PURE UUID: 35866d4f-8fc8-48d5-9b79-619819d8c8b2

Catalogue record

Date deposited: 19 Aug 2008
Last modified: 17 Jul 2017 14:35

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Contributors

Author: Peter P. Wells
Author: Yangdong Qian
Author: Colin R. King
Author: Richard J.K. Wiltshire
Author: Eleanor M. Crabb
Author: Lesley E. Smart
Author: David Thompsett

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