Bismuth and indium co-doping strategy for developing stable and efficient barium zirconate-based proton conductors for high-performance H-SOFCs
By Yihan Ling and Hui Chen and Jinan Niu and Fang Wang and Ling Zhao and Xuemei Ou and Takashi Nakamura and Koji Amezawa
Published in Journal of the European Ceramic Society
2016
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