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J. Korean Ceram. Soc. > Volume 42(12); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(12): 808.
doi: https://doi.org/10.4191/kcers.2005.42.12.808
중온형 고체산화물 연료전지BixCel-xO2-x/2 전해질의 제조 및 특성평가
한주형, 이인성, 이덕열
고려대학교 신소재공학과
Fabrication and Characterization of BixCel-xO2-x/2 Electrolytes for IT-SOFC
Ju-Hyeng Han, In-Sung Lee, Dokyol Lee
Division of Materials Science and Engineering, Korea University
[ $Bi_xCe_{l-x}O_{2-x/2}$ ](BD C : Bismuth Doped Ceria) powders with x = 0.1, 0.2, and 0.3 were synthesized using the Glycine Nitrate Process (GNP). They were then calcined at $500^{circ}C$ for 2 hand sintered in a pellet or rod form at 900, 1000 or $1100^{circ}C$ for 4 h for characterization as the alternative electrolyte material for intermediate temperature solid oxide fuel cells. The BDC powder consisted of a single phase of $CeO_2-Bi_2O_3$ solid solution in the as-synthesized state as well as in the as-calcined state with a mean powder size of 4.5nm in the former state and 6.5 - 10.1nm in the latter. On the contrary, the second phase of $alpha-Bi_2O_3$ was observed to have been formed in the sinter with its amount increasing roughly with increasing temperature or $Bi_2O_3$ content. The BOC powder was superior in sinterability to other alternative electrolyte materials such as GDC, ScSZ, and LSGM with the minimum sintering temperature for a relative density of $95%$ or larger as low as $1100^{circ}C$. The ionic conductivity of BOC increased with $Bi_2O_3$ content and the maximum value of 0.119 S/cm was obtained at $800^{circ}C$ for $Bi_{0.3}Ce_{0.7}O_{1.85}$.
Key words: Bismuth doped ceria, Intermediate temperature SOFC, Alternative electrolyte
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