The porous structure of the catalyst layer of the proton exchange membrane fuel cell(PEMFC)was reconstructed,and the water capillary condensation process in the catalyst layer is simulated by a lattice Boltzmann Shan-Chen model.The effects of operating humidity on proton conduction,electrochemical surface area,and gas transport are analyzed.Based on the developed pore-scale model that couples cathode oxygen transport,proton conductivity,and electrochemical reaction,the distributions of physical quantities in the catalyst layer under different operating conditions are resolved,and the polarization curves of the catalyst layer are obtained.The optimal relative humidity for catalyst layer operation is determined to be 95%—98%.
关键词
燃料电池/催化层/介尺度/数值模拟/液态水
Key words
fuel cell/catalyst layer/mesoscale/numerical simulation/liquid water
维普
万方数据