A PEM fuel cell for in situ XAS studies
Wiltshire, Richard J.K., King, Colin R., Rose, Abigail, Wells, Peter P., Hogarth, Martin P., Thompsett, David and Russell, Andrea E. (2005) A PEM fuel cell for in situ XAS studies. Electrochimica Acta, 50, (25-26), 5208-5217. (doi: 10.1016/j.electacta.2005.05.038).
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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.
|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, platinum, alloys, exafs|
|Subjects:||T Technology > T Technology (General)
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||28 Feb 2006|
|Last Modified:||27 Mar 2014 18:10|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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