【摘要】 质子交换膜燃料电池(PEMFC)阳极闭口模式潜力巨大，但该模式下运行会引发氮气从阴极向阳极的渗透，导致阳极氢气的摩尔分数降低，PEMFC性能下降，针对这种情况可通过吹扫恢复PEMFC的性能。搭建了阳极闭口模式测试系统，在不同操作条件下进行阳极闭口模式实验，同时建立数学模型研究不同电流密度、化学计量比和温度下，电压和阳极氢气的下降速率以及传输到阳极的氮气积累量，提出实验与仿真结合的方法深入探究闭口模式下气体的传输规律，结果表明：当氢气摩尔分数为0.75时，电压下降到1.4 V，此时性能明显下降，提出相应吹扫策略：氢气摩尔分数在0.8时吹扫最为有效。更多还原

【Abstract】 The anode dead-end mode of Proton Exchange Membrane Fuel Cells(PEMFCs) holds significant potential. However, operating under this mode can lead to nitrogen permeation from cathode to anode, which results in anode hydrogen concentration and PEMFC performance decrease. The PEMFC performance can be restored through purging. In this study, a testing system for the anode dead-end mode was constructed, and experiments were performed under different operating conditions. Additionally, a mathematical model was developed to study the rate of voltage decrease and the accumulation of nitrogen transported to the anode under different current densities, stoichiometric ratios, and temperatures. An approach combining experiments and simulations was proposed to investigate the transport patterns of gases in the dead-end mode. The results indicate that when the hydrogen molar fraction is 0.75, the voltage decreases to 1.4 V, and performance deteriorates significantly. A corresponding purging strategy was suggested and the results indicate that purging is most effective when the hydrogen molar fraction is 0.8.更多还原