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
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
2000
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), .
(doi:10.1021/jp992947x).
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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Published date: 2000
Keywords:
ray-absorption-spectroscopy, platinum particles, fine-structure, clusters, coordination, transition, reduction
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Local EPrints ID: 26893
URI: http://eprints.soton.ac.uk/id/eprint/26893
ISSN: 1520-5207
PURE UUID: 61bf8398-ddfe-474c-84c7-746a08cbbd3a
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Date deposited: 25 Apr 2006
Last modified: 16 Mar 2024 02:59
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Author:
S. Maniguet
Author:
R.J. Mathew
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