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EXAFS of carbon monoxide oxidation on supported Pt fuel cell electrocatalysts

EXAFS of carbon monoxide oxidation on supported Pt fuel cell electrocatalysts
EXAFS of carbon monoxide oxidation on supported Pt fuel cell electrocatalysts
The potential dependence of the extended X-ray absorption fine structure (EXAFS) obtained at the Pt LIII absorption edge for a carbon supported Pt electrocatalyst exposed to carbon monoxide is presented. The data have been analyzed using the difference file method to separate the dominant contributions of the Pt neighbors from contributions to the EXAFS from the adsorbed species. The presence of adsorbed CO is clearly observed with a Pt-C distance of 1.85 Å at potentials less than 0.5 V vs RHE. Increasing the potential above 0.5 V resulted first in the removal of the adsorbed CO and at more positive potentials, e.g., 1.05 V, in the formation of an oxide layer, as evidenced by the presence of a Pt-O coordination shell at 2.00 Å. These results demonstrate that in situ EXAFS of supported Pt electrocatalysts may be used to probe adsorbate structures.
ray-absorption-spectroscopy, platinum particles, fine-structure, clusters, coordination, transition, reduction
1520-5207
1998-2004
Maniguet, S.
47033263-20a8-48d4-92a3-1bcb0d6715be
Mathew, R.J.
915a3b01-67bc-4617-ac6e-28bb664c9934
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Maniguet, S.
47033263-20a8-48d4-92a3-1bcb0d6715be
Mathew, R.J.
915a3b01-67bc-4617-ac6e-28bb664c9934
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Maniguet, S., Mathew, R.J. and Russell, A.E. (2000) EXAFS of carbon monoxide oxidation on supported Pt fuel cell electrocatalysts. The Journal of Physical Chemistry B, 104 (9), 1998-2004. (doi:10.1021/jp992947x).

Record type: Article

Abstract

The potential dependence of the extended X-ray absorption fine structure (EXAFS) obtained at the Pt LIII absorption edge for a carbon supported Pt electrocatalyst exposed to carbon monoxide is presented. The data have been analyzed using the difference file method to separate the dominant contributions of the Pt neighbors from contributions to the EXAFS from the adsorbed species. The presence of adsorbed CO is clearly observed with a Pt-C distance of 1.85 Å at potentials less than 0.5 V vs RHE. Increasing the potential above 0.5 V resulted first in the removal of the adsorbed CO and at more positive potentials, e.g., 1.05 V, in the formation of an oxide layer, as evidenced by the presence of a Pt-O coordination shell at 2.00 Å. These results demonstrate that in situ EXAFS of supported Pt electrocatalysts may be used to probe adsorbate structures.

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More information

Published date: 2000
Keywords: ray-absorption-spectroscopy, platinum particles, fine-structure, clusters, coordination, transition, reduction

Identifiers

Local EPrints ID: 26893
URI: http://eprints.soton.ac.uk/id/eprint/26893
ISSN: 1520-5207
PURE UUID: 61bf8398-ddfe-474c-84c7-746a08cbbd3a
ORCID for A.E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 25 Apr 2006
Last modified: 17 Dec 2019 01:56

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Contributors

Author: S. Maniguet
Author: R.J. Mathew
Author: A.E. Russell ORCID iD

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