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Issue 1, 2011
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In situ X-ray probing reveals fingerprints of surface platinum oxide

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Abstract

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.

Graphical abstract: In situ X-ray probing reveals fingerprints of surface platinum oxide

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Publication details

The article was received on 05 Aug 2010, accepted on 08 Oct 2010 and first published on 09 Nov 2010


Article type: Paper
DOI: 10.1039/C0CP01434F
Citation: Phys. Chem. Chem. Phys., 2011,13, 262-266
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    In situ X-ray probing reveals fingerprints of surface platinum oxide

    D. Friebel, D. J. Miller, C. P. O’Grady, T. Anniyev, J. Bargar, U. Bergmann, H. Ogasawara, K. T. Wikfeldt, L. G. M. Pettersson and A. Nilsson, Phys. Chem. Chem. Phys., 2011, 13, 262
    DOI: 10.1039/C0CP01434F

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