PEM水电解池反应特性参数的三维模型数值模拟

Three-dimensional modeling of the reaction characteristic parameters of PEMelectrolysis cells

通过耦合电化学和传质物理场,建立了稳态、单相、三维质子交换膜(PEM)水电解池模型。讨论了不同形式的流场(平行、单通道蛇形、多通道蛇形和交指形流场)对电流密度分布、氧气浓度分布以及压力分布的影响,从而影响对水电解池的性能,并分析了在平行流场中化学计量数对水电解池性能的影响。结果表明,在相同的工况下,交指形流场的性能最差,平行流场的性能最好。同时,增大化学计量数可以明显提高质子交换膜水电解池的性能。

A steady-state,single-phase and three-dimensional model for oxygen evolution reaction in proton exchange membrane(PEM)water electrolysis cells is established by coupling electrochemical and mass transfer physical fields with COMSOL Multiphysics.The effects of different flow fields(parallel,serpentine,multi-serpentine and interdigital flow fields)on current density distribution,oxygen concentration distribution and pressure distribution and the effect of stoichiometry on the performance of the water electrolysis cell were discussed.The simulation results show that the interdigital flow field has the worst performance and the parallel flow field has the best performance under the same working conditions.At the same time,increasing the stoichiometric number can obviously improve the performance of proton exchange membrane water electrolysis cell.