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J. Korean Ceram. Soc. > Volume 51(4); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(4): 283.
doi: https://doi.org/10.4191/kcers.2014.51.4.283
BaZr0.85-xPdxY0.15O3-δ/ Carbonates 복합전도체 전기적 특성 연구
박가영, 백승석, 박준영
세종대학교 나노신소재공학과
Study of Electrical Conductivity of BaZr0.85-xPdxY0.15O3-δ/ Carbonates Composite Materials
Ka-Young Park, Seung-Seok Baek, Jun-Young Park
Department of Nanotechnology and Advanced Materials Engineering, Sejong University
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.
Key words: Protonic ceramic fuel cells, Carbonate, Palladium oxide, Composite electrolyte, Conductivity
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