In Situ X‐Ray Absorption Studies of a Pt‐Ru Electrocatalyst
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X‐ray absorption studies (XAS) were done on a carbon supported Pt‐Ru electrocatalyst in 1 M . Results at the Pt and edges confirmed that the Pt was alloyed with Ru and that the Ru content was about 25 atomic percent. There was a large excess of unalloyed Ru, with only about 10% of the Ru alloyed with the Pt. The Pt XAS indicated that the Ru increased the Pt d band vacancies and decreased the Pt‐Pt bond distances from 2.77 Å to values between 2.71 and 2.73 Å. The bifunctional mechanism for methanol oxidation on Pt‐Ru electrocatalysts needs to be modified to account for the effect of these electronic changes on the adsorption of H and residues from methanol decomposition. There are significant changes in the Pt XAS in going from the reversible hydrogen potential to 0.24 V. This may be due to the onset of the formation of species on the alloy. Further fine tuning of the electronic structure and the electrocatalysis may be possible through the use of ternary alloys.
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McBreen and Mukerjee found that alloying with Ru can cause electronic effects on Pt such as an increase in the number of Pt d band vacancies and a decrease in the Pt-Pt distance.
“They found that alloying with Ru can cause electronic effects on the Pt such as an increase in the number of Pt d band vacancies and a decrease in the Pt-Pt distance.”
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Self-citation
- Authors
- McBreen, J., & Mukerjee, S.
- Affiliations
- Brookhaven National Laboratory (US)
- ORCID
- Mukerjee, Sanjeev
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 1995-10-01
- Volume
- 142
- Issue
- 10
- Pages
- 3399-3404
- ISSN
- 0013-4651 (ISSN-L)
- 1945-7111
- OpenAlex
- W2009320240
- Cited by
- 242
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2023: 3 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 5 · 2017: 7 · 2016: 4 · 2015: 6 · 2014: 10 · 2013: 10 · 2012: 6
- FWCI
- 3.46
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of The Electrochemical Society (publishedVersion)
- Funders
- U.S. Department of Energy
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Keywords
- PtRu alloy, electrocatalysts, carbon-supported catalysts, X-ray absorption spectroscopy, methanol oxidation, bifunctional mechanism, hydrogen adsorption, electronic structure, ternary alloys
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