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Efficient Thickness of Solid Oxide Fuel Cell Composite Electrode

固体氧化物燃料电池复合电极的有效厚度
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摘要 The efficient thickness of a composite electrode for solid oxide fuel cells was directly calculated by developing a physical model taking into account of the charge transfer process, the oxygen ion and electron transportation, and the microstructure characteristics of the electrode. The efficient thickness, which is defined as the electrode thickness corresponding to the minimum electrode polarization resistance, is formulated as a function of charge transfer resistivity, effective resistivity to ion and electron transport, and three-phase boundary length per unit volume. The model prediction is compared with the experimental reports to check the validity. Simulation is performed to show the effect of microstructure, intrinsic material properties, and electrode reaction mechanism on the efficient thickness. The results suggest that when an electrode is fabricated, its thickness should be controlled regarding its composition, particle size of its components, the intrinsic ionic and electronic conductivities,and its reaction mechanisms as well as the expected operation temperatures. The sensitivity of electrode polarization resistance to its thickness is also discussed.
出处 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第2期217-225,I0002,共10页 化学物理学报(英文)
关键词 Composite electrode Solid oxide fuel cell Thickness Modeling Ionic conduc-tivity 复合电极 固体氧化物燃料电池 厚度 模型 离子电导率
分类号 O [理学]
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