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Controlled modification of carbon supported platinum electrocatalysts by Mo

Controlled modification of carbon supported platinum electrocatalysts by Mo
Controlled modification of carbon supported platinum electrocatalysts by Mo
A carbon-supported platinum electrocatalyst was modified with molybdenurr using surface organometallic chemistry. The catalyst was characterized using transmission electron microscopy, cyclic voltammetry (CV), polarization studies, and in situ fluorescence extended X-ray absorption fine structure (EXAFS) studies. The CV and polarization studies show that CO oxidation starts at low overpotentials. similar to those of a conventially prepared PtCoMo/C electrocatalyst. EXAFS at the Mo K edge recorded at 0.65 V show that the Mo exists as an oxide species associated with the Pt surface with a Mo-O distance of 1.75 Angstrom. At 0.05 V this oxide is reduced with the formation of a metal-metal bond between the Mo and Ft, with a bond distance of 2.63 Angstrom.
surface organometallic chemistry, absorption fine-structure, h-2/co mixtures, co tolerance, fuel-cells, electrooxidation, catalysts, electrode, monoxide, deposition
A5-A9
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Ravikumar, M.K.
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Qian, Y.
d8634802-5698-4034-ae09-c6f0a70971d2
Russell, A.E.
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Maniguet, S.
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Yao, J.
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Thompsett, D.
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Hurford, M.
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Ball, S.C.
9cc776ee-ced5-4918-bdf0-b561f9797711
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Ravikumar, M.K.
0b9aaa21-85a8-4ad4-9401-632f91db685d
Qian, Y.
d8634802-5698-4034-ae09-c6f0a70971d2
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Maniguet, S.
47033263-20a8-48d4-92a3-1bcb0d6715be
Yao, J.
5a71a27b-aaf5-4dcd-881a-aed24c8e9c42
Thompsett, D.
6f7014d2-14b6-401e-9da9-7916d48a21dd
Hurford, M.
6e9e86f0-51ae-4d39-9646-b4819c3fb86b
Ball, S.C.
9cc776ee-ced5-4918-bdf0-b561f9797711

Crabb, E.M., Ravikumar, M.K., Qian, Y., Russell, A.E., Maniguet, S., Yao, J., Thompsett, D., Hurford, M. and Ball, S.C. (2002) Controlled modification of carbon supported platinum electrocatalysts by Mo. Electrochemical and Solid-State Letters, 5 (1), A5-A9. (doi:10.1149/1.1419703).

Record type: Article

Abstract

A carbon-supported platinum electrocatalyst was modified with molybdenurr using surface organometallic chemistry. The catalyst was characterized using transmission electron microscopy, cyclic voltammetry (CV), polarization studies, and in situ fluorescence extended X-ray absorption fine structure (EXAFS) studies. The CV and polarization studies show that CO oxidation starts at low overpotentials. similar to those of a conventially prepared PtCoMo/C electrocatalyst. EXAFS at the Mo K edge recorded at 0.65 V show that the Mo exists as an oxide species associated with the Pt surface with a Mo-O distance of 1.75 Angstrom. At 0.05 V this oxide is reduced with the formation of a metal-metal bond between the Mo and Ft, with a bond distance of 2.63 Angstrom.

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Published date: 2002
Keywords: surface organometallic chemistry, absorption fine-structure, h-2/co mixtures, co tolerance, fuel-cells, electrooxidation, catalysts, electrode, monoxide, deposition

Identifiers

Local EPrints ID: 19709
URI: http://eprints.soton.ac.uk/id/eprint/19709
PURE UUID: cee21523-dad2-419b-9043-f9231aa93638
ORCID for A.E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 16 Feb 2006
Last modified: 05 Nov 2019 01:58

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Contributors

Author: E.M. Crabb
Author: M.K. Ravikumar
Author: Y. Qian
Author: A.E. Russell ORCID iD
Author: S. Maniguet
Author: J. Yao
Author: D. Thompsett
Author: M. Hurford
Author: S.C. Ball

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