高电流、低加湿工况下PEMFC的性能研究

Investigations on PEMFC Performance Under High Current Density and Low Humidification

本文建立了一个质子交换膜燃料电池的三维多相流数值模型,并在此模型的基础上,对低加湿工况下的燃料电池性能进行了研究。研究发现在高电流工况下工作的燃料电池对进气加湿的依赖程度降低,其阴极进气不加湿,性能几乎不会下降,阳极进气低加湿时性能虽然有所下降,但幅度较小,主要是因为电池能利用自身阴极催化层产生的水对电解质进行加湿.同时本文还研究发现在阳极低加湿工况下,进气逆流更有利于电池的性能。

A three-dimensional multiphase numerical model for proton exchange membrane fuel cell(PEMFC) is developed in this paper, and PEMFC performance under low inlet humidification is further studied. The results reveal that the dependency on inlet humidification of PEMFC is cut down at high current density;PEMFC performance hardly decreases without inlet humidification in cathode, while it decreases slightly with low inlet humidification in anode. It is because that the water produced in cathode CL can be utilized to humidify the polymer electrolyte. Meanwhile, it can be found that counter-flow is more beneficial to PEMFC performance under low inlet humidification in anode.