Surface strontium segregation of solid oxide fuel cell cathodes proved by in situ depth-resolved x-ray absorption spectroscopy

Yuki Orikasa, Ethan J. Crumlin, Shinnosuke Sako, Koji Amezawa, Tomoya Uruga, Michael D. Biegalski, Hans M. Christen, Yoshiharu Uchimoto, Shao Horn Yang

    研究成果: Article査読

    31 被引用数 (Scopus)

    抄録

    Little is known about the structures and chemistry of perovskites, occurring from the surface to the bulk, at high temperatures and ambient oxygen pressures. Changes in the composition and electronic structure of (001)-oriented La0.8Sr0.2CoO3-δ (LSC) films were investigated by using in situ depth-resolved X-ray adsorption (XAS) under practical operating conditions of solid oxide fuel cells. Depth-resolved XAS spectra of LSC films, with a depth resolution of ~ 2 nm, revealed that the surface regions of ~10 nm were considerably different from the film bulk. The surface regions were enriched in strontium, which can play an important role in governing the oxygen exchange kinetics at the surface.

    本文言語English
    ジャーナルECS Electrochemistry Letters
    3
    4
    DOI
    出版ステータスPublished - 2014 1 1

    ASJC Scopus subject areas

    • Fuel Technology
    • Electrochemistry
    • Materials Chemistry

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