소결 조제를 이용한 고체산화물 연료전지용 세리아 전해질의 저온소결 특성 연구

Abstract

SDC (Samarium doped Ceria) electrolyte was developed for Intermediate temperature SOFC (500°C- 800°C) which showed a good electrical conductivity. In this study, we used sintering aids to reduce the SDC sintering temperature down to 1000°C, especially which can help the SOFC scale-up. In order to reduce the SDC sintering temperature, Li2CO3 and Bi2O3 were used as a sinering aids for decreasing sintering temperature. Li2CO3 and Bi2O3 doped SDC sintered at 1000°C showed 99% of the theoretical density and higher electrical conductivity than the pure SDC sintered at 1500°C. When measuring the OCV (Open circuit voltage) with the Li2CO3 and Bi2O3 doped SDC electrolyte, however, the OCV values were lower than the theoretical OCV values which means that the modified SDC still had electronic conductivity.