A PEM fuel cell for in situ XAS studies
A PEM fuel cell for in situ XAS studies
A miniature proton exchange membrane (PEM) fuel cell has been designed to enable in situ XAS investigations of the anode catalyst using fluorescence detection. The development of the cell is described, in particular the modifications required for elevated temperature operation and humidification of the feed gasses. The impact of the operating conditions is observed as an increase in the catalyst utilisation, which is evident in the EXAFS collected at the Pt L-III and Ru K edges for a PtRu/C catalyst. The Pt component of the catalyst was found to be readily reduced by hydrogen in the fuel, while the Ru was only fully reduced under conditions of good gas flow and electrochemical contact. Under such conditions no evidence of O neighbours were found at the Ru edge. The results are interpreted in relation to the lack of surface sensitivity of the EXAFS method and indicate that the equilibrium coverage of O species on the Ru surface sites is too low to be observed using EXAFS.
pem fuel cell, exafs, platinum, ruthenium, hydrogen x-ray-absorption, ru anode electrocatalyst, carbon-monoxide, oxidation, spectroscopy, catalysts, electrode, alloys
5208-5217
Wiltshire, Richard J.K.
6bec58a5-d664-412f-b7e7-52a6053f75ad
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Rose, Abigail
7e1f0e36-2ad5-4e29-b9b9-756484f1f8c6
Wells, Peter
bc4fdc2d-a490-41bf-86cc-400edecf2266
Hogarth, Martin P.
e90dc448-c813-4e99-82b9-e35308a5a1e7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
5 September 2005
Wiltshire, Richard J.K.
6bec58a5-d664-412f-b7e7-52a6053f75ad
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Rose, Abigail
7e1f0e36-2ad5-4e29-b9b9-756484f1f8c6
Wells, Peter
bc4fdc2d-a490-41bf-86cc-400edecf2266
Hogarth, Martin P.
e90dc448-c813-4e99-82b9-e35308a5a1e7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Wiltshire, Richard J.K., King, Colin R., Rose, Abigail, Wells, Peter, Hogarth, Martin P., Thompsett, David and Russell, Andrea E.
(2005)
A PEM fuel cell for in situ XAS studies.
Electrochimica Acta, 50 (25-26), .
(doi:10.1016/j.electacta.2005.05.038).
Abstract
A miniature proton exchange membrane (PEM) fuel cell has been designed to enable in situ XAS investigations of the anode catalyst using fluorescence detection. The development of the cell is described, in particular the modifications required for elevated temperature operation and humidification of the feed gasses. The impact of the operating conditions is observed as an increase in the catalyst utilisation, which is evident in the EXAFS collected at the Pt L-III and Ru K edges for a PtRu/C catalyst. The Pt component of the catalyst was found to be readily reduced by hydrogen in the fuel, while the Ru was only fully reduced under conditions of good gas flow and electrochemical contact. Under such conditions no evidence of O neighbours were found at the Ru edge. The results are interpreted in relation to the lack of surface sensitivity of the EXAFS method and indicate that the equilibrium coverage of O species on the Ru surface sites is too low to be observed using EXAFS.
This record has no associated files available for download.
More information
Published date: 5 September 2005
Additional Information:
Electrochemistry: from Nanostructures to Power Plants - Selection of papers from the 55th Annual Meeting of the International Society of Electrochemistry (ISE)19-24 September 2004, Thessaloniki, Greece
Keywords:
pem fuel cell, exafs, platinum, ruthenium, hydrogen x-ray-absorption, ru anode electrocatalyst, carbon-monoxide, oxidation, spectroscopy, catalysts, electrode, alloys
Organisations:
Chemistry, Faculty of Natural and Environmental Sciences, Electrochemistry, Organic Chemistry: SCF
Identifiers
Local EPrints ID: 20940
URI: http://eprints.soton.ac.uk/id/eprint/20940
ISSN: 0013-4686
PURE UUID: e8965360-8fdd-422c-8eba-0e1a50b1fa24
Catalogue record
Date deposited: 28 Feb 2006
Last modified: 16 Mar 2024 03:47
Export record
Altmetrics
Contributors
Author:
Richard J.K. Wiltshire
Author:
Colin R. King
Author:
Abigail Rose
Author:
Martin P. Hogarth
Author:
David Thompsett
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
