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Remarkable transport properties switching and surface exchange kinetics in epitaxial PrBaMn2O5+δ films
Acta Materialia ( IF 9.4 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.actamat.2020.01.029
Mingfeng Chen , Xing Xu , Shanyong Bao , Guang-Kun Ren , Yuan-Hua Lin , A.J. Jacobson , Jing Ma , Ce-Wen Nan , Chonglin Chen

Abstract Double perovskite PrBaMn2O5+δ (PBMO), which demonstrates promising application prospect as ceramic anode material for solid oxide fuel cells, was epitaxially grown on (001) LaAlO3 substrate for determining the nature of surface exchange kinetics and oxygen evolution processes. High-temperature X-ray diffraction, X-ray photoelectron spectroscopy, and transport properties measurement indicated that the oxygen vacancy evolution processes are highly dependent upon the interface strain and temperature. Especially, PBMO thin films show reversible redox reactions in the switches between oxygen and hydrogen atmospheres, and the antiphase domain boundary plays a crucial role in the redox processes. Assembled with YSZ electrolyte, the symmetrical cell shows high efficient processes of surface oxygen exchange and virtue of excellent stability, suggest that PBMO is a good candidate for solid oxide fuel cells and chemical sensors.

中文翻译:

外延 PrBaMn2O5+δ 薄膜中显着的传输特性转换和表面交换动力学

摘要 双钙钛矿 PrBaMn2O5+δ (PBMO) 在 (001) LaAlO3 衬底上外延生长,用于确定表面交换动力学和析氧过程的性质,作为固体氧化物燃料电池的陶瓷阳极材料具有广阔的应用前景。高温 X 射线衍射、X 射线光电子能谱和传输特性测量表明氧空位演化过程高度依赖于界面应变和温度。特别是,PBMO 薄膜在氧和氢气氛之间的转换中表现出可逆的氧化还原反应,反相畴界在氧化还原过程中起着至关重要的作用。采用YSZ电解液组装而成的对称电池具有高效的表面氧交换过程和优异的稳定性,
更新日期:2020-03-01
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