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J. Korean Ceram. Soc. > Volume 43(3); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(3): 162.
doi: https://doi.org/10.4191/kcers.2006.43.3.162
저온 작동형 SOFC Lanthanum Ferrite계 공기극 소재의 전기적 특성
강주현, 최정운, 심한별, 유광수
서울시립대학교 신소재공학과
Electrical Properties of the Lanthanum Ferrite-Based Cathode Materials for Low-Temperature SOFCs
Ju-Hyun Kang, Jung-Woon Choi, Han-Byel Shim, Kwang-Soo Yoo
Department of Materials Science and Engineering, University of Seoul
The perovskites with nominal compositions $La_{0.8}Sr_{0.2}Fe_{1-x}M_xO_3$ (M=Co, Mn, Ni, x=0.1-0.3) were fabricated by a solid-state reaction method as cathode materials of low-temperature operating Solid Oxide Fuel Cells (SOFCs). X-ray diffraction analysis and microstructure observation for the sintered samples were performed. The ac complex impedance were measured in the temperature range $600-900^{circ}C$ in air and fitted with a Solatron ZView program. The electrical conductivity and polarization resistance of $La_{0.8}Sr_{0.2}Fe_{1-x}M_xO_3$ (M=Co, Mn, Ni, x=0.1-0.3) were characterized systematically. The porosities of the sintered samples were in the range of 25% to 38%. The polarization resistance of $La_{0.8}Sr_{0.2}Fe_{0.7}M_{0.3}O_3$ was $0.291{Omega}cm^2;at;700^{circ}C$.
Key words: SOFC, Perovskite, LSF, Polarization resistance, Impedance
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