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

To alloy or not to alloy? Cr modified Pt/C cathode catalysts for PEM fuel cells
To alloy or not to alloy? Cr modified Pt/C cathode catalysts for PEM fuel cells
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.
fe, oxygen reduction, k-edge, electronic-structure, properties, electrocatalytic, platinum, surface-composition, edge spectra, co, absorption fine-structure
0301-7249
273-285
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Qian, Yangdong
ce6d3fa1-7a76-4bf7-ad83-ce4213a706a6
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Wiltshire, Richard J.K.
6bec58a5-d664-412f-b7e7-52a6053f75ad
Crabb, Eleanor M.
f3741a11-755e-4020-bf1d-dda1be475a87
Smart, Lesley E.
07794ccd-5e09-47a9-b0d1-72a37e9b0ef7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Qian, Yangdong
ce6d3fa1-7a76-4bf7-ad83-ce4213a706a6
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Wiltshire, Richard J.K.
6bec58a5-d664-412f-b7e7-52a6053f75ad
Crabb, Eleanor M.
f3741a11-755e-4020-bf1d-dda1be475a87
Smart, Lesley E.
07794ccd-5e09-47a9-b0d1-72a37e9b0ef7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

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).

Record type: Article

Abstract

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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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
ORCID for Peter P. Wells: ORCID iD orcid.org/0000-0002-0859-9172
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 19 Aug 2008
Last modified: 10 Dec 2019 01:52

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