Abstract: Commercialization of polymer electrolyte membrane (PEM) fuel cells is seriously restricted by its poor durability. Trace amounts of CO，CO2，H2S and NH3 in fuel gas and pollutants，such as NOx，SOx in air are the main factors which affect the durability of PEMFC. The influence and mechanism of fuel gas impurities and pollutants in air on the performance of PEMFC are reviewed. The CO in fuel gas can influence not only anode performance of PEMFC，but also cathode performance through diffusion and mass transfer. H2S can not only cause serious influence on anode performance，but also obviously damage cathode performance of PEMFC. NOx in air can significantly affect the performance of PEMFC，but this process is reversible. Finally，the research on the effect of impurity gases on the durability of the PEMFC needs to combine computer modeling with experiment tests. In addition，it is necessary to study the effect of impurities on the performance of PEMFC stack.

Key words: Proton Exchange Membrane Fuel Cell, Impurities, Poisoned, Performance degradation, proton exchange membrane fuel cell, impurities, poisoned, performance degradation

摘要： 质子交换膜燃料电池（proton exchange membrane fuel cell，PEMFC）的商业化进程受到了其耐久性的严重制约。燃料气体中含有的微量CO、CO2、H2S和NH3等杂质以及空气中含有的NOx、SOx等污染物是影响PEMFC耐久性的最主要因素之一。本文综述了燃料气体杂质和空气污染物分别对PEMFC性能的影响及其机理，其中燃料中含的CO除了能影响PEMFC的阳极性能以外，还可能通过扩散传质过程对电池阴极性能造成影响；H2S不仅能对电池阳极性能造成严重的影响，也可能对电池阴极性能造成明显的破坏；而空气中的微量NOx会对PEMFC性能造成明显的影响，但NOx对电池性能的影响是一种可逆过程。最后指出对杂质气体影响PEMFC耐久性的研究需要将计算机模型和实际试验相结合，用模型数据指导实验的进行，同时有必要考虑杂质对PEMFC电堆性能的影响。

关键词: 质子交换膜燃料电池, 杂质气体, 毒化, 性能衰减, 质子交换膜燃料电池, 杂质气体, 毒化, 性能衰减