Fabrication of LSM-SDC composite cathodes for intermediate-temperature solid oxide fuel cells |
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| Authors: | Xing Fan Chun-Yan You Ji-Liang Zhu Lu Chen Chang-Rong Xia |
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| Institution: | 1.Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education),China University of Mining and Technology,Xuzhou,China;2.CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering,University of Science and Technology of China, Hefei,Anhui,China;3.School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,China |
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| Abstract: | Microstructure, interfacial resistance, and activation energy for composite cathodes consisting of 50 wt% (La0.85Sr0.15)0.9MnO3-δ (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 °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 Ω cm2 at 800 °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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