Alternation of the Pd lattice in nano-sized-Pd/ZrO2 composite during hydrogen absorption

Yoshinori Arachi, Shuichi Emura, Akira Omura, Masanobu Nunogaki, Takeshi Asai, Shunichi Yamaura, Akihisa Inoue, Yoshiaki Arata

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Structural analysis of high Deuterium absorbed 5 nm Pd particles in dispersed ZrO2 has been carried out using XAFS techniques. X-ray absorption spectra around the Pd K-absorption edge were observed and analyzed. The PdPd bonding distance in the fcc Pd lattice was enlarged by 0.08 ∼ 0.09 Å during absorption of deuterium, and it completely reverted to its original state with the release of deuterium while maintaining the crystal lattice symmetry. These changes provide evidence that deuterium locates not on the surface of the Pd particle, but rather within the Pd crystal lattice. XANES spectra clearly indicate that any change in the oxidation state of Pd are not observed, resulting in no reaction of the absorbed Deuterium atoms with Pd atoms. This paper reports the alternation of Pd lattice in nano-sized composite during hydrogen absorption. The possible models of deuterium position in the Pd lattice are also discussed.

    Original languageEnglish
    Title of host publicationX-RAY ABSORPTION FINE STRUCTURE - XAFS13
    Subtitle of host publication13th International Conference
    Pages740-742
    Number of pages3
    DOIs
    Publication statusPublished - 2007
    EventX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference - Stanford, CA, United States
    Duration: 2006 Jul 92006 Jul 14

    Publication series

    NameAIP Conference Proceedings
    Volume882
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Other

    OtherX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference
    CountryUnited States
    CityStanford, CA
    Period06/7/906/7/14

    Keywords

    • Hydrogen absorption
    • Nano-compsite materials
    • XAFS

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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