Performance comparison of Fick’s, dusty-gas and Stefan–Maxwell models to predict the concentration overpotential of a SOFC anode
Performance comparison of Fick’s, dusty-gas and Stefan–Maxwell models to predict the concentration overpotential of a SOFC anode
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DOI：
10.1016/s0378-7753(02)00724-3
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发表时间：
2003-07
影响因子：
9.2
通讯作者：
R. Suwanwarangkul;E. Croiset;M. Fowler;P. Douglas;E. Entchev;M. Douglas
中科院分区：
文献类型：
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作者：
R. Suwanwarangkul;E. Croiset;M. Fowler;P. Douglas;E. Entchev;M. Douglas
基于Fick模型（FM）、粉尘-气体模型（DGM）和Stefan-Maxwell模型（SMM），建立了多孔SOFC阳极内部的传质模型，并对阳极的浓度过电位进行了预测。用H2-H2O-Ar和CO-CO2体系的实验数据对模型进行了验证。讨论了孔径对所有模型预测的影响。得出的结论是，粉尘-气体模型是最合适的模型来模拟气体传输现象内的SOFC阳极。然而，这个模型需要数值解，而Fick和Stefan-Maxwell不需要。结果表明，对于H_2-H_2O体系，SMM模型比FM模型更接近于粉尘-气体模型，但在高电流密度、低H_2浓度和低孔隙率的情况下，仅推荐使用DGM模型。对于CO-CO2系统，没有简单的规则来选择DGM的替代模型。根据CO浓度、孔隙率和电流密度，可以使用FM或SMM。唯一的限制是仅应使用DGM的小孔隙率。本文还论证了对于多组分体系（H_2-H_2 O-CO-CO_2），只推荐使用DGM。
Models for mass transport inside a porous SOFC anode were developed based on Fick’s model (FM), the dusty-gas model (DGM) and the Stefan–Maxwell model (SMM) to predict the concentration overpotential. All models were validated with experimental data for H2–H2O–Ar and CO–CO2systems. The effect of pore size on all model predictions was discussed. It was concluded that the dusty-gas model is the most appropriate model to simulate gas transport phenomena inside a SOFC anode. However, this model requires numerical solution, whereas Fick’s and Stefan–Maxwell’s do not. It was found that the SMM, rather than the FM, is a good approximation of the dusty-gas model for H2–H2O system, except in the case of high current density, low H2concentration and low porosity, where only the DGM is recommended. For the CO–CO2system, there is no simple rule for selecting an alternate model to DGM. Depending on the CO concentration, porosity and current density, the FM or the SMM could be used. The only restriction is for small porosities where only the DGM should be used. This paper also demonstrated that only the DGM is recommended for a multicomponent system (H2–H2O–CO–CO2).