期刊
IONICS
卷 21, 期 8, 页码 2253-2258出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-015-1396-0
关键词
Composite cathodes; Area-specific resistances; Solid oxide fuel cells; Strontium-doped lanthanum manganite; Samarium-doped ceria
资金
- Ministry of Science and Technology of China [2012CB215403]
- National Natural Science Foundation of China [21206187]
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation (East China Institute of Technology) [JXMS201302]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Microstructure, interfacial resistance, and activation energy for composite cathodes consisting of 50 wt% (La0.85Sr0.15)(0.9)MnO3-delta (LSM) and 50 wt% Sm0.2Ce0.8O1.90 (SDC) were studied for intermediate-temperature solid oxide fuel cells based on SDC electrolytes. Microstructure and interfacial resistance were greatly influenced by the characteristics of starting powder and temperatures sintering the electrodes. Optimum sintering temperatures were 1100 and 950 A degrees C, respectively, for electrodes with SDC prepared using oxalate coprecipitation technique (OCP) and glycine-nitrate process (GNP). Area-specific resistances determined using impedance spectroscopy were 0.47 and 0.92 Omega cm(2) at 800 A degrees C for LSM-SDC/OCP and LSM-SDC/GNP, respectively. The high electrochemical performance is attributed to small grain size, high porosity, and high in-plane electrical conductivity of composite cathode, demonstrating the dramatic effects of microstructure on electrode performance. To increase the electrode performance, it is critical to enhance the diffusion rate of oxygen species.
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