固体氧化物燃料电池阴极数学模型与性能分析

该文针对固体氧化物燃料电池（SOFC）的LSM/YSZ(Sr掺杂LaMnO3 / Y2O3稳定ZrO2)多孔阴极，耦合电极内部离子传导、电子传导、气体扩散与电化学反应过程，建立了全面考虑活化极化、欧姆极化与浓差极化的电极微观数学模型。模型对交换电流密度计算子模型进行了改进，揭示了温度、氧气分压对其的影响，并将三相界 (TPB )定量表示为电极微观结构参数（孔隙率，配位数，接触角等）的函数。模型计算结果与文献中实验数据吻合较好。在此基础上利用该模型对过电位、氧气浓度等参数在电极上的分布进行计算，并研究了混合导体颗粒尺寸、氧气利用率、电极厚度、孔隙结构参数对电极极化的影响。模拟结果对电极微观结构优化及电池运行提供了一定的理论指导。

Solid Oxide Fuel Cell Porous Cathode Micro Modeling and Performance Prediction

A micro model of a solid oxide fuel cell (SOFC) porous LSM/YSZ (Strontium-doped LaMnO3 / Yttrium stabilized Zirconia) cathode was developed. The model coupled the intricate interdependency among the ionic conduction, electronic conduction, gas transport phenomenon and electrochemical processes. All forms of polarization losses were considered. To improve the model generalization, active three-phase boundary (TPB) was expressed as a function of electrode micro structure parameters (porosity, coordination number, contact angle, etc), and exchange current density was treated as a function of cell temperature and oxygen partial pressure. The model results showed good agreement with the published experimental data. The distribution of cell polarization, oxygen concentration was calculated and the effect of particle size, oxygen utilization, electrode thickness as well as porous electrode structure parameters was studied. The model results could provide some fundamental guidelines for SOFC cathode microstructure optimization and SOFC operation.