Thermal expansion and electrochemical properties of La0.7AE0.3CuO3-δ (AE=Ca, Sr, Ba) cathode materials for IT-SOFCs

被引：9

作者：

Ding, Xifeng ^{[1
]}

Gao, Ling ^{[1
]}

Liu, Yingjia ^{[1
]}

Zhen, Yifeng ^{[1
]}

Guo, Lucun ^{[1
]}

机构：

[1] Nanjing Univ Technol, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China

来源：

JOURNAL OF ELECTROCERAMICS | 2007年 / 18卷 / 3-4期

关键词：

SOFC; cathode; thermal expansion; electrochemical performance;

D O I：

10.1007/s10832-007-9173-8

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Alkaline earth metals (Ca, Sr, Ba) substituted lanthanum copper oxides were investigated to evaluate their potentials as cathode materials for intermediate temperature solid oxide fuel cell (IT-SOFC). The crystal structure, thermal expansion and electrochemical performance of La1-x AE (x) CuO3-delta (x=0.3, AE=Ca, Sr, Ba) were studied by X-ray diffraction, thermal dilatometer and impedance spectra, respectively. By lowering the size of the A-site cation in ABO(3) perovskite, a lower thermal expansion and polarization resistance were obtained forCa-doped LaCuO3-delta cathode which showed an area specific resistance of 0.19 Omega cm(-2) under open circuit potential conditions at 800 degrees C, and a polarization overpotential of 52 mV at a current density of 0.1 A/cm(2) at 700 degrees C, being a potential candidate of cathode material for IT-SOFCs.

引用

页码：317 / 322

页数：6

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