Electrochemical Oxidation of Size-Selected Pt Nanoparticles Studied Using in Situ High-Energy-Resolution X-ray Absorption Spectroscopy

    Authors

    L. R. Merte; F. Behafarid; D. J. Miller; D. Friebel; S. Cho; F. Mbuga; D. Sokaras; R. Alonso-Mori; T. C. Weng; D. Nordlund; A. Nilsson;B. R. Cuenya

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    Abbreviated Journal Title

    ACS Catal.

    Keywords

    Pt; PtOx; nanoparticle; electrocatalysis; HERFD-XAS; XANES; OXYGEN REDUCTION REACTION; FUEL-CELL CATALYSTS; PROTON-EXCHANGE; MEMBRANE; PARTICLE-SIZE; PLATINUM NANOPARTICLES; ELECTRONIC-PROPERTIES; DISPERSED PLATINUM; THERMAL-STABILITY; ELECTROCATALYSIS; SURFACE; Chemistry, Physical

    Abstract

    High-energy-resolution fluorescence-detected Xray absorption spectroscopy (HERFD-XAS) has been applied to study the chemical state of similar to 1.2 nm size-selected Pt nanoparticles (NPs) in an electrochemical environment under potential control. Spectral features due to chemisorbed hydrogen, chemisorbed O/OH, and platinum oxides can be distinguished with increasing potential. Pt electro-oxidation follows two competitive pathways involving both oxide formation and Pt dissolution.

    Journal Title

    Acs Catalysis

    Volume

    2

    Issue/Number

    11

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    2371

    Last Page

    2376

    WOS Identifier

    WOS:000310723900018

    ISSN

    2155-5435

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