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Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts

Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts
Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts
A series of ruthenium modified carbon supported catalysts have been prepared by surface organometallic chemistry (SOMC) with the following nominal Ru:Pt surface ratios, (1:4)RuPt/C, (1:2)RuPt/C, (3:4)RuPt/C and (1:1)RuPt/C. The catalysts were characterised using X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), cyclic voltammetry (CV), and half-cell polarisation studies. The XRD measurements showed that a bulk PtRu alloy was not formed following SONIC modification. However, the EXAFS measurements indicated that a surface alloy is formed upon electrochemical reduction of the Ru modified catalysts. The CV studies show that the electrooxidation of CO on the Ru modified Pt/C catalysts occurs at lower potentials than on the unmodified Pt/C catalysts, but at higher potentials than on an alloyed PtRu/C with a bulk composition of 1:1 Pt:Ru. Half cell polarisation measurements in 100 ppm CO in H-2 show that the CO tolerance of the SONIC RuPt/C catalysts approached that of the conventional PtRu/C alloy catalyst. The results therefore indicate that a bulk alloy phase is not an essential factor in the improvement in CO tolerance of PtRu/C catalysts over that of Pt/C.
absorption fine-structure, fuel-cell catalysts, pt-ru, organometallic chemistry, underpotential deposition, methanol electrooxidation, modified pt(111), adsorbed co, oxidation, ruthenium
1463-9076
1792-1798
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Ravikumar, M.K.
0b9aaa21-85a8-4ad4-9401-632f91db685d
Thompsett, D.
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Hurford, M.
6e9e86f0-51ae-4d39-9646-b4819c3fb86b
Rose, A.
44dd032a-db31-411c-a86b-142829cba58f
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Ravikumar, M.K.
0b9aaa21-85a8-4ad4-9401-632f91db685d
Thompsett, D.
6f7014d2-14b6-401e-9da9-7916d48a21dd
Hurford, M.
6e9e86f0-51ae-4d39-9646-b4819c3fb86b
Rose, A.
44dd032a-db31-411c-a86b-142829cba58f
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Crabb, E.M., Ravikumar, M.K., Thompsett, D., Hurford, M., Rose, A. and Russell, A.E. (2004) Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts. Physical Chemistry Chemical Physics, 6 (8), 1792-1798. (doi:10.1039/b400471j).

Record type: Article

Abstract

A series of ruthenium modified carbon supported catalysts have been prepared by surface organometallic chemistry (SOMC) with the following nominal Ru:Pt surface ratios, (1:4)RuPt/C, (1:2)RuPt/C, (3:4)RuPt/C and (1:1)RuPt/C. The catalysts were characterised using X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), cyclic voltammetry (CV), and half-cell polarisation studies. The XRD measurements showed that a bulk PtRu alloy was not formed following SONIC modification. However, the EXAFS measurements indicated that a surface alloy is formed upon electrochemical reduction of the Ru modified catalysts. The CV studies show that the electrooxidation of CO on the Ru modified Pt/C catalysts occurs at lower potentials than on the unmodified Pt/C catalysts, but at higher potentials than on an alloyed PtRu/C with a bulk composition of 1:1 Pt:Ru. Half cell polarisation measurements in 100 ppm CO in H-2 show that the CO tolerance of the SONIC RuPt/C catalysts approached that of the conventional PtRu/C alloy catalyst. The results therefore indicate that a bulk alloy phase is not an essential factor in the improvement in CO tolerance of PtRu/C catalysts over that of Pt/C.

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More information

Published date: 21 April 2004
Keywords: absorption fine-structure, fuel-cell catalysts, pt-ru, organometallic chemistry, underpotential deposition, methanol electrooxidation, modified pt(111), adsorbed co, oxidation, ruthenium

Identifiers

Local EPrints ID: 20176
URI: https://eprints.soton.ac.uk/id/eprint/20176
ISSN: 1463-9076
PURE UUID: d0d50f43-c782-429d-a095-334b6337de72
ORCID for A.E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 21 Feb 2006
Last modified: 06 Jun 2018 12:58

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