Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrical Conductivity of ZrO2 Doped with Sc2O3 and CeO2

Sc2O3와 CeO2가 첨가된 ZrO2의 전기전도도

  • 이동석 (한국과학기술연구원 재료연구부) ;
  • 허장원 (한국과학기술연구원 재료연구부) ;
  • 김재동 (한국과학기술연구원 재료연구부) ;
  • 김주선 (한국과학기술연구원 재료연구부) ;
  • 이해원 (한국과학기술연구원 재료연구부) ;
  • 김긍호 (한국과학기술연구원 재료연구부) ;
  • 김대준 (한국과학기술연구원 재료연구부) ;
  • 이종호 (한국과학기술연구원 재료연구부)
  • Published : 2002.01.01
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Abstract

The electrical conductivity and phase stability of $ZrO_2$ doped with $Sc_2O_3$ and $CeO_2$ were investigated in order to search for better solid electrolyte material for solid oxide fuel cell. Present study showed that $ZrO_2$ doped with $Sc_2O_3$ and $CeO_2$ exhibited no phase transition during the heat treatment up to $1350^{Circ}C∼1550^{Circ}C$ and was stable as a cubic phase in whole temperature ranges. The $ZrO_2$ doped with $Sc_2O_3$ and $CeO_2$ showed much higher electrical conductivity than YSZ in the temperature range of $300∼^{Circ}C$ and better long term stability than other sc-$ZrO_2$ based electrolyte that showed the possibility as a strong candidate electrolyte material for intermediate-or low-temperature SOFC.

중저온 영역에서 작동 가능한 고체산화물연료전지(SOFC)의 전해질 재료를 탐색하기 위해 $Sc_2O_3$와 $CeO_2$를 동시에 첨가하여 안정화시킨 $CeO_2$의 상안전성과 전기적 물성을 분석하였다. 분석결과 $Sc_2O_3$와 $CeO_2$를 동시에 첨가하여 안정화시킨 $ZrO_2$는 $1350^{Circ}C∼1550^{Circ}C$까지의 열처리과정중 다른 상전이 없이 상온에서 안정한 입방정상을 유지하였으며 넓은 온도영역($300∼^{Circ}C$)에서 기존의 YSZ보다 훨씬 높은 전기전도도값을 나타냈다. 또한 $Sc_2O_3$와 $CeO_2$가 동시에 첨가된 $ZrO_2$는 기존의 Sc-$ZrO_2$계 전해질 물질보다 훨씬 향상된 장기안정성을 나타내 중저온형 고체산화물 연료전지의 전해질재료로 적합함을 알 수 있었다.

Keywords

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