The University of Southampton
University of Southampton Institutional Repository

Potential dependence of segregation and surface alloy formation of a Ru modified carbon supported Pt catalyst

Potential dependence of segregation and surface alloy formation of a Ru modified carbon supported Pt catalyst
Potential dependence of segregation and surface alloy formation of a Ru modified carbon supported Pt catalyst
Ruthenium modified carbon supported platinum catalysts have been shown to have a similar activity towards carbon monoxide oxidation as conventionally prepared bimetallic PtRu alloy catalysts. In this study the effect of the applied electrode potential and potential cycles on the location and oxidation state of the Ru species in such Ru modified Pt/C catalysts was investigated using in situ EXAFS collected at both the Ru K and Pt L3 absorption edges. The as prepared catalyst was found to consist of a Pt core with a Ru oxy/hydroxide shell. The potential dependent data indicated alloying to form a PtRu phase at 0.05 V versus RHE and subsequent dealloying to return to the Ru oxy/hydroxide decorated Pt surface at potentials greater than 0.7 V. The Ru–O distances obtained indicate that both Ru3+ and Ru4+ species are present on the surface of the Pt particles at oxidising potentials; the former is characteristic of the as prepared Ru modified Pt/C catalyst and following extensive periods at potentials above 0.7 V and the latter of the Ru oxide species on the PtRu alloy.
platinum, fuel-cell electrocatalysts, pt(111) electrode, deposition, platinum nanoparticles, ruthenium, co oxidation, underpotential deposition, monoxide, absorption fine-structure, methanol, exafs, fuel cell catalysts, co electrooxidation, oxidation, ptru
0013-4686
5556-5564
Rose, A.
44dd032a-db31-411c-a86b-142829cba58f
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Qian, Y.D.
4dbeb4cf-099b-4cab-a45e-b6ac1a2eda09
Ravikumar, M.K.
0b9aaa21-85a8-4ad4-9401-632f91db685d
Wells, P.P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Wiltshire, R.J.K.
f707675a-4f95-44c1-bd6b-97db2457c551
Yao, J.
5a71a27b-aaf5-4dcd-881a-aed24c8e9c42
Bilsborrow, R.
4f9b5bd7-b5c4-4142-84fc-2b77b5065fee
Mosselmans, F.
42877bfd-e5e8-4e31-9563-24deaf0ea56b
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Rose, A.
44dd032a-db31-411c-a86b-142829cba58f
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
Qian, Y.D.
4dbeb4cf-099b-4cab-a45e-b6ac1a2eda09
Ravikumar, M.K.
0b9aaa21-85a8-4ad4-9401-632f91db685d
Wells, P.P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Wiltshire, R.J.K.
f707675a-4f95-44c1-bd6b-97db2457c551
Yao, J.
5a71a27b-aaf5-4dcd-881a-aed24c8e9c42
Bilsborrow, R.
4f9b5bd7-b5c4-4142-84fc-2b77b5065fee
Mosselmans, F.
42877bfd-e5e8-4e31-9563-24deaf0ea56b
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Rose, A., Crabb, E.M., Qian, Y.D., Ravikumar, M.K., Wells, P.P., Wiltshire, R.J.K., Yao, J., Bilsborrow, R., Mosselmans, F. and Russell, A.E. (2007) Potential dependence of segregation and surface alloy formation of a Ru modified carbon supported Pt catalyst. Electrochimica Acta, 52 (18), 5556-5564. (doi:10.1016/j.electacta.2007.02.023).

Record type: Article

Abstract

Ruthenium modified carbon supported platinum catalysts have been shown to have a similar activity towards carbon monoxide oxidation as conventionally prepared bimetallic PtRu alloy catalysts. In this study the effect of the applied electrode potential and potential cycles on the location and oxidation state of the Ru species in such Ru modified Pt/C catalysts was investigated using in situ EXAFS collected at both the Ru K and Pt L3 absorption edges. The as prepared catalyst was found to consist of a Pt core with a Ru oxy/hydroxide shell. The potential dependent data indicated alloying to form a PtRu phase at 0.05 V versus RHE and subsequent dealloying to return to the Ru oxy/hydroxide decorated Pt surface at potentials greater than 0.7 V. The Ru–O distances obtained indicate that both Ru3+ and Ru4+ species are present on the surface of the Pt particles at oxidising potentials; the former is characteristic of the as prepared Ru modified Pt/C catalyst and following extensive periods at potentials above 0.7 V and the latter of the Ru oxide species on the PtRu alloy.

This record has no associated files available for download.

More information

Submitted date: 27 December 2006
Published date: 2007
Keywords: platinum, fuel-cell electrocatalysts, pt(111) electrode, deposition, platinum nanoparticles, ruthenium, co oxidation, underpotential deposition, monoxide, absorption fine-structure, methanol, exafs, fuel cell catalysts, co electrooxidation, oxidation, ptru

Identifiers

Local EPrints ID: 54376
URI: http://eprints.soton.ac.uk/id/eprint/54376
ISSN: 0013-4686
PURE UUID: 04aac50c-d744-4a03-b99e-60057ed9d07f
ORCID for P.P. Wells: ORCID iD orcid.org/0000-0002-0859-9172
ORCID for A.E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 31 Jul 2008
Last modified: 16 Mar 2024 03:47

Export record

Altmetrics

Contributors

Author: A. Rose
Author: E.M. Crabb
Author: Y.D. Qian
Author: M.K. Ravikumar
Author: P.P. Wells ORCID iD
Author: R.J.K. Wiltshire
Author: J. Yao
Author: R. Bilsborrow
Author: F. Mosselmans
Author: A.E. Russell ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×