阳极操作条件对HT-PEMFC电流分布的影响

Effect of anode operating conditions on current distribution of HTPEMFC

高温质子交换膜燃料电池(HT-PEMFC)阳极采用重整气为燃料时,阳极操作条件对HT-PEMFC电流分布的均匀性有重要影响,并进一步影响电池的性能和寿命。探究了重整气组成、燃料化学计量比和放电电流对电流分布均匀性的影响。研究结果表明重整气组分中H_(2)含量越低,CO含量越高,电流分布不均匀程度越大;降低燃料化学计量比和增加放电电流均导致电流分布均匀性降低,且H_(2)含量更低,CO含量更高的重整气为燃料时,燃料化学计量比和放电电流对电流分布的影响更加显著。研究结果可为HT-PEMFC流场结构、膜电极结构设计和操作条件优化提供指导。

When the high temperature proton exchange membrane fuel cell(HT-PEMFC)is fueled with reformate gas in anode,the anodic operating conditions have important effects on the uniformity of current distribution,and further affect the performance and durability.In this work,experiments were carried out to investigate the effect of operating conditions,such as gas contents,stoichiometry and average current on current distribution.The experimental results show that lower H_(2) concentration and higher CO concentration cause uneven current distribution.Reducing the anode stoichiometry and increasing the average current both resulted in a decrease of current distribution uniformity,and the reformate gas with lower H_(2) concentration and the higher CO concentration has a more pronounced impact on current distribution.The results of this work can provide guidance for design flow field or the structure of membrane electrode assembly(MEA)and for optimizing operating conditions of HT-PEMFC.