扩散层孔隙率对PEMFC性能影响的模拟研究

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/cm². 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.