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采用一维稳态宏观均相模型,首次对不同阴极催化层(CCL)厚度的质子交换膜燃料电池(PEMFC)在全操作电流范围内的功率输出进行了计算和比较。在催化层中各相的体积比不变的前提下,催化层厚度以2种方式变化:一是变化单位面积催化层内的Pt载量;二是变化Pt在碳载铂(Pt/C)催化剂颗粒中的质量分数。2种方式的模拟结果均表明,催化层较厚的PEMFC具有较高的功率输出。但是从提高催化剂利用率角度考虑,第1种催化层厚度变化方式中催化层越薄催化剂利用率越高,第2种方式相反。在本研究设定的CCL参数范围内,最适宜厚度催化层在整个电流密度范围内都使PEMFC有最高的功率输出。
For the first time, the power output of proton exchange membrane fuel cell (PEMFC) with different cathode catalyst layer (CCL) thickness was calculated and compared in the full operating current range using one-dimensional steady-state macroscopic homogeneous model. The catalytic layer thickness changes in two ways: the first is to change the Pt loading per unit area of the catalytic layer; the second is to change the Pt in platinum on carbon (Pt / C) The mass fraction of catalyst particles. Both simulation results show that the thicker catalytic layer PEMFC has a higher power output. However, from the viewpoint of improving the catalyst utilization efficiency, the catalyst layer utilization rate is higher in the first catalyst layer thickness variation mode, and the second mode is opposite. Within the CCL parameters set in this study, the optimum thickness catalyst layer gave the PEMFC the highest power output over the entire current density range.