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J. Korean Ceram. Soc. > Volume 51(4); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(4): 289.
doi: https://doi.org/10.4191/kcers.2014.51.4.289
고체산화물 연료전지 스택 열화 방지를 위한 전해질 기술
박미영, 배홍열1, 임형태
창원대학교 신소재공학부
1포항산업과학연구원 연료전지연구단
Bi-layer Electrolyte for Preventing Solid Oxide Fuel Cell Stack Degradation
Mi Young Park, Hongyeul Bae1, Hyung-Tae Lim
School of Materials Science and Engineering, Changwon National University
1Fuel Cell Project, Research Institute of Industrial Science and Technology (RIST)
The stability of a solid oxide fuel cell (SOFC) stack is strongly dependent on the magnitude and profile of the internal chemical potential of the solid electrolyte. If the internal partial pressure is too high, the electrolyte can be delaminated from the electrodes. The formation of high internal pressure is attributed to a negative cell voltage, and this phenomenon can occur in a bad cell (with higher resistance) in a stack. This fact implies that the internal chemical potential plays an important role in determining the lifetime of a stack. In the present work, we fabricate planar type anode-supported cells ($25cm^2$) with a bi-layer electrolyte (with locally increased electronic conduction at the anode side) to prevent high internal pressure, and we test the fabricated cells under a negative voltage condition. The results indicate that the addition of electronic conduction in the electrolyte can effectively depress internal pressure and improve the cell stability.
Key words: Planar type SOFC, Cell imbalance, Stack degradation
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