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In situ x-ray probi...
In situ x-ray probing reveals the importance of surface platinum oxide formation in fuel cell catalysis
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Friebel, Daniel (author)
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Miller, Daniel J. (author)
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O'Grady, Christopher P. (author)
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Anniyev, Toyli (author)
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Bargar, John (author)
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Bergmann, Uwe (author)
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Ogasawara, Hirohito (author)
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- Wikfeldt, Kjartan Thor (author)
- Stockholms universitet,Fysikum
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- Pettersson, Lars G. M. (author)
- Stockholms universitet,Fysikum
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- Nilsson, Anders (author)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 13:1, s. 262-266
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https://www.slac.sta...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- In situ X-ray absorption spectroscopy (XAS) at the Pt L3 edge is a useful probe for Pt–O interactions at polymer electrolyte membrane fuel cell (PEMFC) cathodes. We show that XAS using the high energy resolution fluorescence detection (HERFD) mode, applied to a well-defined monolayer Pt/Rh(111) sample where the bulk penetrating hard X-rays probe only surface Pt atoms, provides a unique sensitivity to structure and chemical bonding at the Pt-electrolyte interface. Ab initio multiple-scattering calculations using the FEFF code and complementary extended X-ray absorption fine structure (EXAFS) results indicate that the commonly observed large increase of the white-line at high electrochemical potentials on PEMFC cathodes originates from platinum oxide formation, whereas previously proposed chemisorbed oxygen-containing species merely give rise to subtle spectral changes.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Physics
- Fysik
- kvantkemi
- Quantum Chemistry
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Friebel, Daniel
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Miller, Daniel J ...
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O'Grady, Christo ...
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Anniyev, Toyli
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Bargar, John
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Bergmann, Uwe
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show more...
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Ogasawara, Hiroh ...
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Wikfeldt, Kjarta ...
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Pettersson, Lars ...
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Nilsson, Anders
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Physical Chemist ...
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Stockholm University