Bismuth and indium co-doping strategy for developing stable and efficient barium zirconate-based proton conductors for high-performance H-SOFCs

By Ling, Yihan; Chen, Hui; Niu, Jinan; Wang, Fang; Zhao, Ling; Ou, Xuemei; Nakamura, Takashi; Amezawa, Koji
Published in Journal of the European Ceramic Society NULL 2016

Abstract

Abstract High-temperature proton conductors gained ever-increasing interest as electrolyte materials alternative to oxygen-ion conductors due to their high conductivity associated with low activation energy at reduced temperatures. In this study, we reported our findings on chemically stable, easily sintered and highly proton-conductive BaZrO3 oxides with Bi2O3 and In2O3 co-addition as electrolyte materials for proton conducting solid oxide fuel cells (H-SOFCs). Among the composition series, BaZr0.75In0.2Bi0.05O3?? (BZIB5) exhibited the improved sinterability and good conductivity. Correspondingly, high-temperature gravimetry results indicated that the concentrations of protonic defect and oxygen vacancy strongly depended on P(H2O) and temperature rather than P(O2). Importantly, single cells with 12-?m-dense {BZIB5} electrolyte films were successfully fabricated, and achieved high performance with the maximum power density of 0.34 Wcm?2 at 700

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