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J. Korean Ceram. Soc. > Volume 43(5); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(5): 270.
doi: https://doi.org/10.4191/kcers.2006.43.5.270
LSGM계 전해질 지지형 고체산화물 연료전지의 특성평가
송은화, 김광년, 정태주1, 손지원, 김주선, 이해원, 김병국, 이종호
한국과학기술연구원 재료연구부
1안동대학교 재료공학과
Characterization of the LSGM-Based Electrolyte-Supported SOFCs
Eun-Hwa Song, Kwang-Nyeon Kim, Tai-Joo Chung1, Ji-Won Son, Joo-Sun Kim, Hae-Weon Lee, Byung-Kook Kim, Jong-Ho Lee
Materials Division, Korea Institute of Science and Technology
1Department of Ceramics Engineering, Andong National University
LSGM(($La_xSr_{1-x})(Ga_yMg_{1-y})O_3$) electrolyte is known to show very serious interfacial reaction with other unit cell components, especially with an anode. Such an interfacial reaction induced the phase instability of constituent component and deterioration of the unit cell performance, which become the most challenging issues in LSGM-based SOFCs. In this study, we fabricated LSGM($La_{0.8}Sr_{0.2}Ga_{0.83}Mg_{0.17}O_x$) electrolyte supported-type cell in order to avoid such interfacial problem by lowering the heat-treatment temperature of the electrode fabrication. According to the microstructural and phase analysis, there was no serious interfacial reaction at both electrolyte/anode and electrolyte/cathode interfaces. Moreover, from the electrochemical characterization of the unit cell performance, there was no distinct deterioration of the open cell voltage as well as an internal cell resistance. These results demonstrate the most critical point to be concerned in LSGM-based SOFC is either to find a proper electrode material which will not give any interfacial reaction with LSGM electrolyte or to properly adjust the processing variables for unit cell fabrication, to reduce the interfacial reaction.
Key words: SOFC, LSGM, Electrolyte, Tape casting, Interfacial reaction
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