Superactivation of metal electrode surfaces and its relevance to COads oxidation at fuel cell anodes

Burke, L.D., Horgan, M.A., Hurley, L.M., Nagle, L.C., & O'Mullane, A.P. (2001) Superactivation of metal electrode surfaces and its relevance to COads oxidation at fuel cell anodes. Journal of Applied Electrochemistry, 31(7), pp. 729-738.

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The inhibiting effect of COads on platinum-based anodes is a major problem in the development of ambient temperature, polyelectrolyte membrane-type fuel cells. One of the unusual features of the response for the oxidative removal of the species in question is that the response observed for this reaction in the positive sweep is highly dependent on the CO admission potential, for example, when the COads is formed in the Hads region it undergoes oxidation at unusually low potentials. Such behaviour is attributed here to hydrogen activation of the platinum surface, with the result that oxide mediators (and COads oxidation) occurs at an earlier stage of the positive sweep. It is also demonstrated, for both platinum and gold in acid solution, that dramatic premonolayer oxidation responses may be observed following suitable preactivation of the electrode surfaces. It is suggested that the defect state of a solid electrode surface is an important variable whose investigation may yield improved fuel cell anode performance.

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10 citations in Scopus
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7 citations in Web of Science®

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ID Code: 64279
Item Type: Journal Article
Refereed: Yes
Additional Information: Prior to commencement at QUT
Additional URLs:
Keywords: COads oxidation, electrocatalysis, fuel cells, gold, platinum, superactivation
DOI: 10.1023/A:1017580329289
ISSN: 1572-8838
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 21 Nov 2013 01:28
Last Modified: 21 Nov 2013 01:30

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