Abigail Rose
Potential dependence of segregation and surface alloy formation of a Ru modified carbon supported Pt catalyst
Rose, Abigail; Crabb, Eleanor M.; Qian, Yangdong; Ravikumar, M.K.; Wells, Peter P.; Wiltshire, Richard J.K.; Yao, Jun; Bilsborrow, Robert; Mosselmans, Fred; Russell, Andrea E.
Authors
Eleanor M. Crabb
Yangdong Qian
M.K. Ravikumar
Peter P. Wells
Richard J.K. Wiltshire
Dr Jun Yao Jun.Yao@uwe.ac.uk
Senior Lecturer Aerospace Themofluids
Robert Bilsborrow
Fred Mosselmans
Andrea E. Russell
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 L 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 Ru and Ru 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. © 2007 Elsevier Ltd. All rights reserved. 3 3+ 4+
Citation
Rose, A., Crabb, E. M., Qian, Y., Ravikumar, M., Wells, P. P., Wiltshire, R. J., …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. https://doi.org/10.1016/j.electacta.2007.02.023
Journal Article Type | Article |
---|---|
Online Publication Date | Feb 16, 2007 |
Publication Date | May 10, 2007 |
Deposit Date | Apr 17, 2021 |
Journal | Electrochimica Acta |
Print ISSN | 0013-4686 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 52 |
Issue | 18 |
Pages | 5556-5564 |
DOI | https://doi.org/10.1016/j.electacta.2007.02.023 |
Keywords | Electrochemistry; General Chemical Engineering |
Public URL | https://uwe-repository.worktribe.com/output/7267911 |
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