Microstructures and interfacial resistance of LSM-SDC composite cathodes for IT-SOFCs

作者：Fan X^*; Xia CR; Yang X; Meng GY

来源：Journal of Inorganic Materials, 2004, 19(5): 1038-1044.

• composite cathodes
• interfacial resiatance
• doped ceria
• SOFCs

Microstructures, interfacial resistances, and activation energy of the symmetrical composite cathodes [50wt%(La0.85Sr0.15)(0.9)MnO3-delta(LSM)+50wt% Sm0.2Ce0.8O1.90] were studied for intermediate temperature (550similar to800degreesC) solid oxide fuel cells (IT-SOFCs) based on Sm0.2Ce0.8O1.90 (SDC) electrolytes. The optimum sintering temperatures for LSM+GNP-SDC and LSM+OCP-SDC composite cathodes are 1200degreesC and 1250degreesC, respectively. The interfacial resistances at 800degreesC are 0.78 and 0.35Omega(.)cm(2), respectively, for LSM+GNP-SDC and LSM+OCP-SDC, as determined using AC impedance spectroscopy. The electrical conductivity of composite electrodes depends on the electrodes microstructures, which are greatly influenced by starting powder characteristics and sintering temperatures.

• 出版日期2004-9
• 单位中国科学技术大学