Characterization and Stability of La0.7Sr0.3Co0.3Fe0.7O3 Perovskite-type Oxide
Compositely doped oxide La0.7Sr0.3Co0.3Fe0.7O3（LSCF）was synthesized using solid state reaction and citric acid-nitrate low temperature self-propagating combustion methods. The crystal structure and the particle size micrograph of LSCF powders synthesized by different methods were investigated with XRD and SEM. The experimental results show that the single perovskites phase of LSCF can be synthesized by both methods. The particle size of LSCF by citric acid-nitrate low temperature self-propagating combustion method was the smaller. Two types of cathodes wafers were fabricated with the two kinds of LSCF powders and Ce0.9Gd0.1O1.95 (GDC) at the mass rate of 6:4, respectively. The electrical conductivity of sintered samples was measured by four probe DC method from 100℃-800℃ The cathode with LSCF particle by citric acid-nitrate low temperature self-propagating combustion method has the higher electrical conductivity. The conduction mechanism for the samples is attributable to the adiabatic-hopping of p-type small polaron. In order to investigate the stability, the samples were put into the muffle furnace to heat up in air at 800℃ for 800h. To analyze the reason for reduced electrical conductivity, the crystal structure and the particle micrograph of the cathodes before and after exposure were investigated with XRD and SEM. The result shows that both cathodes have good stability, good compatibility with GDC. The sample micrographs do not change too much. The electrical conductivity of the two cathodes reduces a little after exposure.
Solid oxide fuel cell La0.7Sr0.3Co0.3Fe0.7O3 synthesis method Cathode Electrical conductivity Stability
LI Yan Luo Zhongyang Yu Chunjiang Wei Xinli Cen Kefa
School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）