Microstructures and Interfacial Resistance of LSM-SDC Composite Cathodes for IT-SOFCs

Journal of Inorganic Materials

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Microstructures and Interfacial Resistance of LSM-SDC Composite Cathodes for IT-SOFCs

FAN Xing, XIA Chang-Rong, YANG Xin, MENG Guang-Yao

Laboratory for Biomass Clean Energy, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Received:2003-09-22 Revised:2003-10-16 Published:2004-09-20 Online:2004-09-20

Abstract

Abstract: Microstructures, interfacial resistances, and activation energy of the symmetrical composite cathodes [50wt%(La_0.85Sr_0.15)_0.9MnO_3-δ(LSM)+50wt%
Sm_0.2Ce_0.8O_1.90] were studied for intermediate temperature (550～800℃) solid oxide fuel cells (IT-SOFCs) based on
Sm_0.2Ce_0.8O_1.90 (SDC) electrolytes. The optimum sintering temperatures for LSM+GNP-SDC and LSM+OCP-SDC composite cathodes are
1200℃ and 1250℃, respectively. The interfacial resistances at 800℃ are 0.78 and 0.35Ω·cm², 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.

Key words: composite cathodes, interfacial resiatance, doped ceria, SOFCs

CLC Number:

TM911

FAN Xing,XIA Chang-Rong,YANG Xin,MENG Guang-Yao. Microstructures and Interfacial Resistance of LSM-SDC Composite Cathodes for IT-SOFCs[J]. Journal of Inorganic Materials.

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Microstructures and Interfacial Resistance of LSM-SDC Composite Cathodes for IT-SOFCs

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