Preparation of yttria-stabilized zirconia thin films on strontium-doped LaMnO 3 cathode substrates via electrophoretic deposition for solid oxide fuel cells

Tatsumi Ishihara, Kuninobu Shimose, Takanari Kudo, Hiroyasu Nishiguchi, Taner Akbay, Yusaku Takita

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    Abstract

    A yttria-stabilized zirconia (YSZ) thin film on an La 0.8Sr 0.2MnO 3 porous cathode substrate was prepared, using electrophoretic deposition (EPD) to fabricate a solid oxide fuel cell (SOFC). The electrical conductivity of an La 0.8Sr 0.2MnO 3 substrate is satisfactorily high at room temperature; therefore, YSZ powder could be deposited electrophoretically onto an La 0.8Sr 0.2MnO 3 substrate without any extra surface treatment, such as a metal coating. Successive repetition of EPD and sintering was required to obtain a film without gas leakage, because of the thermal expansion coefficient mismatch between the YSZ and the La 0.8Sr 0.2MnO 3 substrate. On the other hand, the electromotive force of the oxygen concentration in the cell that used YSZ film prepared via EPD increased and attained the theoretical value when the number of deposition and calcination cycles was increased. Six or more successive repetitions were required to obtain a YSZ film without gas leakage. A planar-type SOFC was fabricated, using nickel as the anode and YSZ film ( approximately 10 μm thick) that had been deposited onto the La 0.8Sr 0.2MnO 3 substrate as the electrolyte and cathode. The cell exhibited an open circuit voltage of 1.0 V and a maximum power density of 1.5 W/cm 2. Thus, the EPD method could be used as a colloidal process to prepare YSZ thin-film electrolytes for SOFCs.

    Original languageEnglish
    Pages (from-to)1921-1927
    Number of pages7
    JournalJournal of the American Ceramic Society
    Volume83
    Issue number8
    Publication statusPublished - Aug 1 2000

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Materials Chemistry

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