An approximate analytical solution of transport model in electrodes for anode‐supported solid oxide fuel cells
An approximate analytical solution of transport model in electrodes for anode‐supported solid oxide fuel cells
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DOI：
10.1002/aic.11297
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发表时间：
2007-11
期刊：
影响因子：
3.7
通讯作者：
Cheng Bao;N. Cai
中科院分区：
文献类型：
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作者：
Cheng Bao;N. Cai
基于二元混合物燃料的阳极支撑型固体氧化物燃料电池阳极一维等温机理模型，建立了两种同时考虑质量和电荷传递的近似解析解。首先，将阳极划分为活性区和非活性区，采用正则摄动法近似计算燃料浓度和过电位的分布。然后用奇异摄动法得到的近似解同时反映了阳极两个边界处电流密度的边界层效应。在中、低负荷情况下，两种近似解与数值解都符合得很好。通过引入阳极/电解质界面处边界层厚度的概念，这两个近似解可以结合起来，得到一个显式表达式，在很宽的操作范围内。本文的研究结果对系统级建模和动态分析具有一定的参考价值。2007美国化学工程师学会AIChE J，53：2968-2979，2007
On the basis of the one-dimensional, isothermal mechanistic model in the anode of an anode-supported solid oxide fuel cell using binary mixture as fuel, two approximate analytical solutions considering both mass and charge transfer were developed in this article. First, by dividing the anode into the inactive and active zones, the regular perturbation method was used to approximate the distribution of the fuel concentration and overpotential. Then the approximate solution using the singular perturbation method reflects both the boundary-layer effects of current density at the two boundaries of the anode. Both the two approximate solutions agree well with the numeric solution in the case of medium and low electric load. By introducing the concept of the boundary-layer thickness at the anode/electrolyte interface, the two approximate solutions can be combined to get an explicit expression in a wide range of operation. The result in this article is useful to system-level modeling and dynamic analysis. 2007 American Institute of Chemical Engineers AIChE J, 53: 2968–2979, 2007