A bi-layered composite cathode of La0.8Sr0.2MnO3-YSZ and La0.8Sr0.2MnO3-La0.4Ce0.6O1.8 for IT-SOFCs

被引:30
作者
Zhang, Min [1 ,2 ]
Yang, Min [1 ,2 ]
Hou, Zhifang [1 ]
Dong, Yonglai [1 ]
Cheng, Mojie [1 ]
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
bi-layered composite cathode; La0.8Sr0.2MnO3; La0.4Ce0.6O1.8; YSZ; solid oxide fuel cells;
D O I
10.1016/j.electacta.2008.01.095
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A bi-layered composite cathode of La0.8Sr0.2MnO3 (LSM)-YSZ and LSM-La0.4Ce0.6O1.8 (LDC) was fabricated for anode-supported solid oxide fuel cells with a thin YSZ electrolyte film. The cell with the bi-layered composite cathode displayed better performance than the cell with the corresponding single-layered composite cathode of LSM-LDC or LSM-YSZ. At 650 degrees C, the cell with the bi-layered composite cathode gave a higher maximum power density than the cells with the single-layered LSM-LDC and LSM-YSZ composite cathodes, by 52% and 175%, respectively. The impedance spectra results show that the thin LSM-YSZ interlayer not only improves the cathode/electrolyte interface but also reduces the polarization resistance of the cathode. The activation energy for oxygen reduction on the bi-layered composite cathode is much smaller than that on LSM-YSZ composite cathode, and it is suggested that the special redox property of Ce4+/Ce3+ in LDC facilitates the oxygen reduction process on the bi-layered composite cathode. The cell with the bi-layered composite cathode operated quite stably during a 100 h run. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4998 / 5006
页数:9
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