为了研究扩散层孔隙率对质子交换膜燃料电池（PEMFC）性能的影响，采用COMSOL软件，通过数值模拟得出气体扩散层不同孔隙率（0.2，0.4，0.6和0.8）时，单直通道和具有楔形肋片(长1 mm，高1.5 mm，宽2 mm)的PEMFC性能曲线、阴极氧气质量分数分布和水质量分数分布。结果表明：扩散层孔隙率对燃料电池性能具有较大影响，随着扩散层孔隙率从0.2增大到0.8，PEMFC的电流密度逐渐增加，最大可达847 mA/cm2；相对于单直通道，增加孔隙率比添加楔形肋片更利于提升电池性能；在孔隙率为0.6和0.8时，氧气更易扩散到反应区，排水效果更好。

To investigate the effect of different gas diffusion layer porosities on the proton exchange membrane fuel cells (PEMFC) performance, the numerical simulation was carried out for the influence of different gas diffusion layer porosities(0.2,0.4,0.6 and 0.8) on the PEMFC performance with the single straight channel and wedgeshaped fins (1 mm×1.5 mm×2 mm) by COMSOL software. The battery performance curve, the distribution of cathode oxygen mass fraction and water mass fraction is obtained. The simulation results show that the diffusion layer porosity has a significant influence on the performance of the fuel cell. With the increase of diffusion layer porosity from 0.2 to 0.8, the current density of PEMFC gradually increases, and the maximum can reach 847 mA/cm2. In comparison with the single straight channel, the increase of porosity improves the PEMFC performance more significantly than the addition of wedgeshaped fins. At the porosity of 0.6 and 0.8, oxygen is easier to diffuse into the reaction zone, and the drainage effect becomes better.

TM911.4

国家重点研发计划项目(2017YFB0102704)