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J. Korean Ceram. Soc. > Volume 36(9); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(9): 982.
고체산화물 연료전지용 $YSZ/La_0.85S_r0.15MnO_3$계 복합전극의 개발
윤성필, 현상훈, 김승구1, 남석우1, 홍성안1
연세대학교 세라믹공학과
1한국과학기술연구원 전지.연료전지연구센터
Development of $YSZ/La_0.85S_r0.15MnO_3$ Composite Electrodes for Solid Oxide Fuel Cells
YSZ/LSM composite cathode was fabricated by dip-coating of YSZ sol on the internal pore surface of a LSM cathode followed by sintering at low temperature (800-100$0^{circ}C$) The YSZ coating significantly increased the TPB(Triple Phase Boundary) where the gas the electrode and the electrolyte were in contact with each other. Sinter the formation of resistive materials such as La2Zr2O7 or SrZrO3 was prevented due to the low processing temperature and TPB was increased due to the YSZ film coating the electrode resistance (Rel) was reduced about 100 times compared to non-modified cathode. From the analysis of a.c impedance it was shown that microstructural change of the cathode caused by YSZ film coating affected the oxygen reduction reaction. In the case of non-modified cathode the RDS (rate determining step) was electrode reactions rather than mass transfer or the oxygen gas diffusion in the experimental conditions employed in this study ($600^{circ}C$-100$0^{circ}C$ and 0,01-1 atm of Po2) for the YSZ film coated cathode however the RDS involved the oxygen diffusion through micropores of YSZ film at high temperature of 950-100$0^{circ}C$ and low oxygen partial pressure of 0.01-0.03 atm.
Key words: Composite electorde, LSM cathode, Sol-gel coating, Oxyge reduction reaction, Rate determining step
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