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Mathematical modeling of solid oxide fuel cells at high fuel utilization based on diffusion equivalent circuit model

Authors

  • Cheng Bao,

    Corresponding author
    1. Dept. of Thermal Science and Energy Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
    2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, People's Republic of China
    • Dept. of Thermal Science and Energy Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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  • Yixiang Shi,

    1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, People's Republic of China
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  • Chen Li,

    1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, People's Republic of China
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  • Ningsheng Cai,

    1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, People's Republic of China
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  • Qingquan Su

    1. Dept. of Thermal Science and Energy Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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Abstract

Mass transfer and electrochemical phenomena in the membrane electrode assembly (MEA) are the core components for modeling of solid-oxide fuel cell (SOFC). The general MEA model is simply governed with the Stefan-Maxwell equation for multicomponent gas diffusion, Ohm's law for the charge transfer and the current-overpotential equation for the polarization calculation. However, it has obvious discrepancy at high-fuel utilization or high-current density. An advanced MEA model is introduced based on the diffusion equivalent circuit model. The main purpose is to correct the real-gas concentrations at the triple-phase boundary by assuming that the resistance of surface diffusion is in series with that of the gaseous bulk diffusion. Thus, it can obtain good prediction of cell performance in a wide range by avoiding the decrement of effective gas diffusivity via unreasonable increment of the electrode tortuosity in the general MEA model. The mathematical model has been validated in the cases of H2[BOND]H2O, CO[BOND]CO2 and H2[BOND]CO fuel system. © 2009 American Institute of Chemical Engineers AIChE J, 2010

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