Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication and Characterization of BixCel-xO2-x/2 Electrolytes for IT-SOFC

중온형 고체산화물 연료전지BixCel-xO2-x/2 전해질의 제조 및 특성평가

  • Han, Ju-Hyeng (Division of Materials Science and Engineering, Korea University) ;
  • Lee, In-Sung (Division of Materials Science and Engineering, Korea University) ;
  • Lee, Dokyol (Division of Materials Science and Engineering, Korea University)
  • 한주형 (고려대학교 신소재공학과) ;
  • 이인성 (고려대학교 신소재공학과) ;
  • 이덕열 (고려대학교 신소재공학과)
  • Published : 2005.12.01
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Abstract

[ $Bi_xCe_{l-x}O_{2-x/2}$ ](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 $Bi_{0.3}Ce_{0.7}O_{1.85}$.

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References

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