High thermal stability of three-dimensionally ordered nano-composite cathodes for solid oxide fuel cells

被引：7
作者：
Li, Juan [1 ,2 ]
Zhang, Naiqing [2 ]
Sun, Kening [2 ]
Wu, Zhengbin [1 ]
机构：
[1] Chinese Acad Sci, Shenzhen Inst Adv Technol, Elect Vehicle Res & Dev Ctr, Shenzhen 518055, Peoples R China
[2] Harbin Inst Technol, Acad Fundamental & Interdisciplinary Sci, Harbin 150001, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2016年 / 187卷
关键词：
Solid oxide fuel cells; Three-dimensionally ordered architecture; Silica opal; Thermal stability; Oxygen reduction reaction kinetics; PERFORMANCE; FABRICATION; ELECTRODES; REDUCTION; CO;
D O I：
10.1016/j.electacta.2015.11.063
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A non-close-packed (NCP) silica opal connected by cylindrical rods was prepared using a selective etching technique. Using sol-gel impregnation of the NCP silica opal template, La0.8Sr0.2MnO3/Zr0.84Y0.16O2 (LSM/YSZ) composite cathodes were fabricated for solid oxide fuel cells. The microstructure of the as-prepared cathode revealed three-dimensionally (3D) ordered hollow spheres connected by cylindrical tubes. Even after high-temperature sintering at 1000 degrees C, the 3D ordered nano-network remained stable. Electrochemical impedance spectroscopy was used to study the oxygen reduction reaction kinetics of the 3D ordered LSM/YSZ electrode. The impedance behavior was similar to that of a mixed ionic-electronic conductor, different from the behavior of traditional micro-scaled LSM/YSZ electrodes. The nanometer-scale particle size and continuous nano-network are the main reasons for this divergence in behavior. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：179 / 185
页数：7
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