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J. Korean Ceram. Soc. > Volume 42(9); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(9): 637.
doi: https://doi.org/10.4191/kcers.2005.42.9.637
LSGM계 고체산화물 연료전지의 계면안정성을 위한 완층층의 도입
김광년, 문주호1, 손지원2, 김주선2, 이해원2, 이종호2, 김병국2
한국과학기술연구원 재료연구부, 연세대학교 세라믹공학과
1연세대학교 세라믹공학과
2한국과학기술연구원 재료연구부
Introduction of a Buffering Layer for the Interfacial Stability of LSGM-Based SOFCs
Kwang-Nyeon Kim, Jooho Moon1, Ji-Won Son2, Joosun Kim2, Hae-Weon Lee2, Jong-Ho Lee2, Byung-Kook Kim2
Materials Division, Korea Institute of Science and Technology, School of Advanced Materials Engineering, Yonsei University
1School of Advanced Materials Engineering, Yonsei University
2Materials Division, Korea Institute of Science and Technology
In order to find a proper buffering material which can prohibit an unwanted interfacial reaction between anode and electrolyte of LSGM-based SOFC, we examined a gadolinium doped ceria and scandium doped zirconia as a candidate. For this examination, we investigated the microstructural and phase stability of the interface under different buffering layer conditions. According to the investigation, ceria based material induced a serious La diffusion out of the LSGM electrolyte resulted in the formation of very resistive $LaSrGa_3O_7$ phase at the interface. On the other hand zirconia based material was directly reacted with LSGM electrolyte and thus produced very resistive reaction products such as $La_2Zr_2O_7,;Sr_2ZrO_4,;LaSrGaO_4;and;LaSrGa_3O_7$. From this study we found that an improper buffering material induced the higher internal cell resistance rather than an interfacial stability.
Key words: SOFC, LSGM, GDC, ScSZ, Buffering layer, Interfacial reaction
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