Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Study of Electrical Conductivity of BaZr0.85-xPdxY0.15O3-δ/ Carbonates Composite Materials

BaZr0.85-xPdxY0.15O3-δ/ Carbonates 복합전도체 전기적 특성 연구

  • Park, Ka-Young (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Baek, Seung-Seok (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Park, Jun-Young (Department of Nanotechnology and Advanced Materials Engineering, Sejong University)
  • 박가영 (세종대학교 나노신소재공학과) ;
  • 백승석 (세종대학교 나노신소재공학과) ;
  • 박준영 (세종대학교 나노신소재공학과)
  • Received : 2014.06.16
  • Accepted : 2014.07.08
  • Published : 2014.07.31
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Abstract

PdO-doped $BaZr_{0.85}Y_{0.15}O_{3-\delta}$ (BZPY) proton conductors have been proposed as applicable for intermediate temperature electrolytes for protonic ceramic fuel cells (PCFCs) because the PdO doping is effective for improving the proton conductivity of $BaZr_{0.85}Y_{0.15}O_{3-\delta}$ (BZY) with high affinity for hydrogen. In order to further improve the conductivity of BZPY, two-phase composite electrolytes consisting of a BZPY and molten carbonate were designed. Dense BZPY-based composite electrolytes were fabricated after sintering at $670^{\circ}C$ for 4 h, since molten carbonates fill the grain boundary of the porous BZPY matrix. Furthermore, BZPY/$(Li-0.5Na)_2CO_3$ composites show a significantly enhanced protonic conductivity at intermediate temperatures. This may be because easy proton transport is possible through the interface of the carbonate and oxide phase.

Keywords

References

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