Visualization of the Heterogeneity of Cerium Oxidation States in Single Pt/Ce2Zr2Ox Catalyst Particles by Nano-XAFS

Authors

  • Dr. Nozomu Ishiguro,

    1. Research Center for Materials Science, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602 (Japan)
    2. Institute for Molecular Science, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585 (Japan)
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  • Prof. Dr. Tomoya Uruga,

    1. Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofu, Tokyo 182-8585 (Japan)
    2. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Dr. Oki Sekizawa,

    1. Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofu, Tokyo 182-8585 (Japan)
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  • Dr. Takuya Tsuji,

    1. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Dr. Motohiro Suzuki,

    1. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Dr. Naomi Kawamura,

    1. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Dr. Masaichiro Mizumaki,

    1. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Dr. Kiyofumi Nitta,

    1. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
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  • Prof. Dr. Toshihiko Yokoyama,

    1. Institute for Molecular Science, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585 (Japan)
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  • Prof. Dr. Mizuki Tada

    Corresponding author
    1. Research Center for Materials Science, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602 (Japan)
    2. Institute for Molecular Science, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585 (Japan)
    • Research Center for Materials Science, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602 (Japan)===

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  • XAFS= X-ray absorption fine structure

Abstract

The cerium oxidation states in single catalyst particles of Pt/Ce2Zr2Ox (x=7 to 8) were investigated by spatially resolved nano X-ray absorption fine structure (nano-XAFS) using an X-ray nanobeam. Differences in the distribution of the Ce oxidation states between Pt/Ce2Zr2Ox single particles of different oxygen compositions x were visualized in the obtained two-dimensional X-ray fluorescent (XRF) mapping images and the Ce LIII-edge nano X-ray absorption near-edge structure (nano-XANES) spectra.

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