Investigation of Mixed Conductor BaCo0.7Fe0.3-xYxO3-δ with High Oxygen Permeability

被引:74
作者
Zhao, Hailei [1 ,3 ]
Xu, Nansheng [1 ,3 ]
Cheng, Yunfei [1 ]
Wei, Wenjing [1 ]
Chen, Ning [1 ,3 ]
Ding, Weizhong [2 ]
Lu, Xionggang [2 ]
Li, Fushen [1 ,3 ]
机构
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China
[3] Beijing Key Lab New Energy Mat & Technol, Beijing 100083, Peoples R China
关键词
PEROVSKITE-TYPE OXIDES; TEMPERATURE FUEL-CELLS; EFFECTIVE IONIC-RADII; SOLID ELECTROLYTES; CERAMIC MEMBRANES; ELECTRICAL-PROPERTIES; TITANATE CERAMICS; IT-SOFCS; PERMEATION; TRANSPORT;
D O I
10.1021/jp106220z
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Cubic BaCo0.7Fe0.3-xYxO3-delta (BCFY, x = 0.08-0.02) was prepared by the conventional solid state reaction route as oxygen permeation membranes. The effects of Y-doping on the crystal structure, electrical conductivity, and oxygen permeability are investigated, and the factors influencing the activation energy of oxygen migration are discussed front the viewpoints of metal oxygen bonding energy and geometric lattice structure. Y-substitution decreases the electrical conductivity but increases the oxygen vacancy concentration of BCFY samples. Nevertheless, the oxygen permeability decreases with increasing Y-doping level. Both the strong Y-O bonding energy and the decreased critical radius (r(C)) with Y-doping should be responsible for the increased activation energy. First principle calculation reveals that Y-doping results in the nonequivalent positions of the mobile oxygen ions and thus limits die oxygen ion diffusion passages. BaCo0.7Fe0.3-xYxO3-delta membrane exhibits a high oxygen permeability of 1.73 mL.min(-1) cm(-2) at 900 degrees C, thus being a promising candidate material for oxygen separation or POM applications.
引用
收藏
页码:17975 / 17981
页数:7
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