Abstract: A two dimensional mathematical model was developed for the cathode of proton exchange membrane fuel cell with conventional flow field operating with air. The continuity equation, Darcy’s equation for porous medium, conductive equation and the convection-diffusion equation for O₂ and water vapor were used in the gas diffuser, and a coupled boundary condition given by Butler-Volmer equation was used at the cathode catalyst layer interface. The current density distribution in the diffuser, the concentration of O₂ and water vapor in the diffusion layer, the local current density distribution at the catalyst layer interface were calculated. The mechanism of gas transport in the cathode gas diffuser, the characterization of gaseous species concentration distribution in the cathode of PEMFCs with conventional flow field were studied.

Key words:

质子交换膜燃料电池, 数值模拟, 条形流场, 扩散层

摘要： 对采用常规条形流场的H₂-Air PEMFCs阴极建立了二维数学模型，模型的控制方程耦合了连续性方程、Darcy方程、电传导方程以及O₂和H₂O的对流-扩散方程，对氧的电化学还原反应过程采用Butler-Volmer方程描述.利用模型计算了阴极扩散层中电流密度、O₂和H₂O浓度、催化层界面上局部电流密度的分布，分析了采用常规条形流场时气体在阴极扩散层中的传递机制及各组分浓度分布的特点.

关键词:

质子交换膜燃料电池, 数值模拟, 条形流场, 扩散层