Numerical modeling of an anode-supported SOFC button cell considering anodic surface diffusion
Numerical modeling of an anode-supported SOFC button cell considering anodic surface diffusion
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DOI：
10.1016/j.jpowsour.2006.10.091
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发表时间：
2007-02
影响因子：
9.2
通讯作者：
Yixiang Shi;N. Cai;Chen Li
中科院分区：
文献类型：
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作者：
Yixiang Shi;N. Cai;Chen Li
建立了阳极支撑固体氧化物燃料电池的二维等温机理模型。该模型耦合了离子传导、电子传导、气体输运和电化学反应过程之间的复杂相互依赖关系。包括所有形式的极化。同时考虑了分子扩散、努森扩散以及简化的竞争吸附和表面扩散。一个电子模拟电路被用来确定有效的氢扩散率。根据基线工况下的实验数据进行参数估计后，在不进行任何其他标定的情况下，对不同的H2-H2O混合物进行了实验验证，结果与已发表的实验数据吻合较好。预测了电池的组分浓度和电流密度分布，研究了阴极面积、气体组分和阳极厚度对电池性能的影响。
A two-dimensional isothermal mechanistic model of an anode-supported solid oxide fuel cell was developed based on button-cell geometry. The model coupled the intricate interdependency among the ionic conduction, electronic conduction, gas transport, and the electrochemical reaction processes. All forms of polarizations were included. The molecular diffusion, Knudsen diffusion, as well as the simplified competitive adsorption and surface diffusion were also considered. An electric analogue circuit was used to determine the effective hydrogen diffusivity. The model results showed good agreement with the published experimental data in different H2–H2O mixtures without any other calibrations after the parameter estimation according to the experimental data in baseline operating condition. The distributions of species concentration and current density were predicted and the effects of cathode area, gas components, and anode thickness on the cell performance were studied.