This paper studies the effects of propylene, methyl methacrylate (MMA) and isopropanol (IPA) in air on the spatial performance of proton exchange membrane fuel cells (PEMFCs). The introduction of 100 ppm C₃H₆ into the oxidant stream resulted in a performance decrease of 130 mV at 1.0 A cm⁻², whereas 20 ppm MMA caused a voltage loss of 80 mV. A moderate performance decline of 60 mV was detected in the presence of 5.3⋅10³ ppm IPA in air. Spatial electrochemical impedance spectroscopy (EIS) data showed an increase in charge and mass transfer resistances under exposure to C₃H₆ and MMA, although IPA did not affect the impedance. The observed PEMFC performances, local current redistributions and EIS data can be explained by the adsorption of contaminants on the Pt surface, their subsequent transformations, and their impacts on the electrochemical surface area and oxygen reduction mechanism. It was assumed that the studied contaminants were oxidized mainly to CO₂ via electrochemical and chemical pathways under the operating conditions and at the cathode potential. Self-recovery of PEMFC performance was observed for each contaminant after halting its introduction into the air. Possible contaminant oxidation/reduction mechanisms and their correlations with spatial performance and EIS are presented and discussed.

本文研究了空气中丙烯，甲基丙烯酸甲酯（MMA）和异丙醇（IPA）对质子交换膜燃料电池（PEMFC）空间性能的影响。将100 ppm C ₃ H ₆引入氧化剂物流导致在1.0 A cm ^-2处的性能下降130 mV ，而20 ppm MMA引起的电压损失为80 mV。在5.3⋅10的存在下检测到的60毫伏的温和性能下降³  ppm的IPA中的空气。空间电化学阻抗谱（EIS）数据显示，暴露于C ₃ H ₆下，电荷和传质电阻增加和MMA，尽管IPA不会影响阻抗。观察到的PEMFC性能，局部电流重新分布和EIS数据可以通过Pt表面上污染物的吸附，其随后的转变以及它们对电化学表面积和氧还原机理的影响来解释。假定在工作条件下和在阴极电势下，所研究的污染物主要通过电化学和化学途径被氧化为CO ₂。在停止将PEMFC引入空气后，观察到PEMFC性能的自我恢复。提出并讨论了可能的污染物氧化/还原机理及其与空间性能和EIS的关系。