Preparation of Electrolyte Thin Film on NiO-YSZ Porous Substrate for Solid Oxide Fuel Cells by Electrophoretic Deposition(I)

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J. Korean Ceram. Soc. > Volume 36(5); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(5): 521.

전착법에 의한 다공성 NiO-YSZ 기판위에 SOFC용 전해질 박막제조(I)

김상우, 이병호, 손용배¹, 송휴섭

한국과학기술원 세라믹공정센터
¹한국과학기술원 세라믹공정센

Preparation of Electrolyte Thin Film on NiO-YSZ Porous Substrate for Solid Oxide Fuel Cells by Electrophoretic Deposition(I)

ABSTRACT

Yttria-stabilized zirconia(YSZ) thin film for an anode support type solid oxide fuel cell(SOFC) was prepared by electrophoretic deposition (EPD). Kinetic model and properties of electrolyte film obtained by EPD on porous NiO-YSZ substrate were investigated. In the constant current mode the deposited weight increased with time and the curve was well-fitted by Dihyperbola type function. In constant voltage mode the deposited weight saturated with time and the curve was fitted by the modified Zhangs' equation. There was little difference in the weight and microstructure of films between constant current and constant voltage conditions in short time(under 30s) but the surface of deposited film at constant current condition was more smooth than that at constant voltage condition. Although zircona films obtained under either conditons at low electric field for long time processing contained defects such as saggning and crack sagging of film at constant voltage condition was more severe than for constant current condition YSZ thin film with uniform thickness of less than 10㎛ by EPD was formed at constant current 0.035 mA/cm2 for 10s

Key words: SOFC, EPD, Constant current mode, Constant voltage mode, YSZ, Kinetic model