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Efficient Thickness of Solid Oxide Fuel Cell Composite Electrode
Zhi-yi Jiang,Chang-rong Xia*,Fang-lin Chen
Author NameAffiliationE-mail
Zhi-yi Jiang CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Chang-rong Xia* CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China xiacr@ustc.edu.cn 
Fang-lin Chen Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA  
Abstract:
The efficient thickness of a composite electrode for solid oxide fuel cells was directly calcu- lated 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 elec-trode. The efficient thickness, which is defined as the electrode thickness corresponding to the minimum electrode polarization resistance, is formulated as a function of charge trans-fer 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.
Key words:  Composite electrode, Solid oxide fuel cell, Thickness, Modeling, Ionic conduc-tivity
FundProject:
Efficient Thickness of Solid Oxide Fuel Cell Composite Electrode
蒋治亿,夏长荣*,陈仿林
摘要:
利用一个物理模型计算了固体氧化物燃料电池复合电极的有效厚度. 此模型考虑了复合电极内部的电化学反应,电子和离子的传递,以及电极的微结构. 电极的有效厚度对应于电极性能最优时电极的理论厚度,经过模型计算表明此厚度同时为电荷转移电阻率、有效离子(电子)电阻率以及单位体积内三相线长度的函数. 通过与实验数据比较验证了模型的可用性. 通过模拟表明电极成分、粒子大小、电极材料的本征电阻率、不同的操作温度以及电极反应的机理都影响着复合电极的有效厚度.
关键词:  复合电极,固体氧化物燃料电池,厚度,模型,离子电导率
DOI:10.1088/1674-0068/23/02/217-225
分类号: