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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on Sintering Behavior and Conductivity for NiO-doped BaZr0.85Y0.15O3-δ

NiO가 도핑된 BaZr0.85Y0.15O3-δ의 소결거동 및 전도도에 관한 연구

  • Park, Young-Soo (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hae-Kyoung (School of Materials Science & Engineering, Yeungnam University) ;
  • Hwang, Kwang-Tak (Korea Institute of Ceramic Engineering and Technology)
  • 박영수 (한국세라믹기술원 이천분원 도자세라믹센터) ;
  • 김진호 (한국세라믹기술원 이천분원 도자세라믹센터) ;
  • 김혜경 (영남대학교 신소재공학부) ;
  • 황광택 (한국세라믹기술원 이천분원 도자세라믹센터)
  • Received : 2012.09.28
  • Accepted : 2012.12.31
  • Published : 2012.12.31
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Abstract

Perovskite-type oxides such as doped barium zirconate ($BaZrO_3$) show high proton conductivity and chemical stability when they are exposed to hydrogen and water vapour containing atmospheres, thus it can be applicable to the hydrogen separation and the fuel cell electrolyte membranes. However the high temperature ($1700-1800^{\circ}C$) and long sintering times (24h) are generally required to prepare the fully densified $BaZrO_3$ pellets. These sintering conditions lead to the limitation of the grain size growth and the degradation of conductivity due to the acceleration of BaO evaporation at $1200^{\circ}C$. Here we demonstrate NiO-doped $BaZr_{0.85}Y_{0.15}O_{3-{\delta}}$ with lower calcination and sintering temperature, less experimental procedure and lower process cost than the conventional mixing method. The stoichiometry of $BaZr_{0.85}Y_{0.15}O_{3-{\delta}}$ was optimized by the control of excess amount of Ba (5mol%) to minimized BaO evaporation. We found that the crystal size of NiO-doped $BaZr_{0.85}Y_{0.15}O_{3-{\delta}}$ was increased with increase of calcination temperature from XRD analysis. NiO-doped $BaZr_{0.85}Y_{0.15}O_{3-{\delta}}$ powder was calcined at $1000^{\circ}C$ for 12h when its showed the highest conductivity of $3.3{\times}10^{-2}s/cm$.

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References

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