Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Chemical Instability of $BaCeO_3$-Based Proton Conducting Oxide

$BaCeO_3$계 프로톤 전도 산화물의 화학적 불안정성

  • 변명섭 (국립경상대학교 나노신소재공학부) ;
  • 강은태 (국립경상대학교 나노신소재공학부) ;
  • 조우석 (한국세라믹기술원 이천분원) ;
  • 김진호 (한국세라믹기술원 이천분원) ;
  • 황광택 (한국세라믹기술원 이천분원)
  • Received : 2011.01.27
  • Accepted : 2011.02.18
  • Published : 2011.02.28
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Abstract

Barium cerate ($BaCeO_3$) related perovskite ceramics currently dominate the high-temperature proton conductor field. Unfortunately, these materials have very stringent environmental limitations necessitating the costly and complex conditioning or cleaning of the application feed-gas. Commercial realization has been hampered, in part, because of the reactivity of $BaCeO_3$ with $CO_2$, and to some extent $H_2O$. And sintered $BaCeO_3$ decomposed at a rate comparable to the powder samples. In this article, the chemical stability and the structural changes of $BaCe_{0.9-X}Y0.1La_XO_{3-\delta}$ (X=0, 0.1, 0.2) have been systematically investigated in the atmosphere containing carbon dioxide ($CO_2$) and water vapor ($H_2O$). The sintering characteristics were studied in $1600^{\circ}C$, sintered pellets disintegrate and decompose upon contacting boiling water on the surface only.

Keywords

References

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