Surface segregation and inter-diffusion of cations and impurities in microelectrodes for solid oxide fuel cells and electrolysers

H. Téllez, J. Druce, Y. Shi, M. Kubicek, Neil J. Simrick, J. L.M. Rupp, T. Ishihara, J. Kilner

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    3 被引用数 (Scopus)

    抄録

    The surface segregation and inter-diffusion of cations and impurities in La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF) electrode structures micro-patterned on a Zr0.84Y0.16O1.92 (YSZ) single crystal was investigated by high-resolution Time-of-Flight Secondary Ion Mass Spectrometry and Low-Energy Ion Scattering. The outermost and near surface of the microelectrodes showed significant changes after patterning and electrochemical testing of the cell. As occurring in bulk LSCF ceramics, Sr segregation towards the surface is observed after annealing at 500°C. Furthermore, the electrode showed that impurities (i.e. Na, Si and Ca) originating from the YSZ electrolyte bulk migrate actively to the LSCF electrode during electrochemical testing. The impurity migration has implications for oxygen surface exchange at the cathodeelectrolyte and air interface for solid oxide fuel cells: the electrolyte YSZ surface becomes cleaner whereas the segregation of Sr to the LSCF outer surface seems to be suppressed with respect to the operation time of the device.

    本文言語英語
    ホスト出版物のタイトルSolid-Gas Electrochemical Interfaces � SGEI 1
    編集者E. Ivers-Tiffee, M. B. Mogensen, S. B. Adler, T. Kawada
    出版社Electrochemical Society Inc.
    ページ69-77
    ページ数9
    2
    ISBN(電子版)9781607685395
    DOI
    出版ステータス出版済み - 2015
    イベント1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting - Chicago, 米国
    継続期間: 5月 24 20155月 28 2015

    出版物シリーズ

    名前ECS Transactions
    番号2
    66
    ISSN(印刷版)1938-5862
    ISSN(電子版)1938-6737

    その他

    その他1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting
    国/地域米国
    CityChicago
    Period5/24/155/28/15

    !!!All Science Journal Classification (ASJC) codes

    • 工学一般

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