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J. Korean Ceram. Soc. > Volume 44(12); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(12): 727.
doi: https://doi.org/10.4191/kcers.2007.44.1.727
저온 고체산화물 연료전지용 공기극 미세구조 제어 및 성능개선
강중구, 김진수1, 윤성필
한국과학기술연구원 연료전지연구단
1경희대학교 화학공학과
Cathode Microstructure Control and Performance Improvement for Low Temperature Solid Oxide Fuel Cells
Jung-Koo Kang, Jin-Soo Kim1, Sung-Pil Yoon
Center for Fuel Cell Research, KIST
1Department of Chemical Engineering, Kyunghee University
ABSTRACT
In order to fabricate a highly performing cathode for low-temperature type solid oxide fuel cells working at below $700^{circ}C$, electrode microstructure control and electrode polarization measurement were performed with an electronic conductor, $La_{0.8}Sr_{0.2}MnO_3$ (LSM) and a mixed conductor, $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$(LSCF). For both cathode materials, when $Sm_{0.2}Ce_{0.8}O_2$ (SDC) buffer layer was formed between the cathode and yttria-stabilized zirconia (YSZ) electrolyte, interfacial reaction products were effectively prevented at the high temperature of cathode sintering and the electrode polarization was also reduced. Moreover, cathode polarization was greatly reduced by applying the SDC sol-gel coating on the cathode pore surface, which can increase triple phase boundary from the electrolyte interface to the electrode surface. For the LSCF cathode with the SDC buffer layer and modified by the SDC sol-gel coating on the cathode pore surface, the cathode resistance was as low as 0.11 ${Omega}{cdot}cm^2$ measured at $700^{circ}C$ in air atmosphere.
Key words: Highly performing cathode, Low-temperature solid oxide fuel cell, Electrode microstructure control, Buffer layer, Sol-gel coating
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