The effects of NO₂ cathode exposure on the localized performance of high- and low-Pt proton exchange membrane fuel cells (PEMFCs) operated under high power generating conditions were studied and compared. Introduction of 2 ppm NO₂ in the cathode feed gas caused a spatial performance distribution and voltage drop of 80 and 130 mV for high- and low-Pt samples, respectively. A full recovery of the cell voltage was observed after stopping the NO₂ injection in the air stream only for high-Pt cells, while low-Pt cells had a partial recovery. The performance loss could be attributed to the dissociative adsorption of NO₂ on Pt with the formation of NO and its further reduction to N₂O via two consecutive electron and proton transfer steps. Cathode exposure to 2–5 ppm NO₂ led to a decrease in the electrochemical area (ECA) of 17–18 and 21–23% for the high- and low-Pt samples, respectively, which exceeded the ECA loss in reference tests in pure air. The low-Pt PEMFC performance loss after poisoning by 1–2 ppm NO₂ could be recovered applying cyclic voltammetry. However, poisoning by 5 ppm NO₂ led to a serious decline in the spatial low-Pt PEMFC performance of 10–70 mV.

研究并比较了NO ₂阴极暴露对在高发电条件下运行的高和低Pt质子交换膜燃料电池（PEMFC）局部性能的影响。在阴极进料气中引入2 ppm NO ₂导致高和低Pt样品的空间性能分布和电压降分别为80和130 mV。仅对于高Pt电池，停止在空气流中注入NO ₂后观察到电池电压的完全恢复，而低Pt电池则部分恢复。性能损失可归因于NO ₂在Pt上的解离吸附以及NO的形成及其进一步还原为N _{2的原因。}O通过两个连续的电子和质子转移步骤。阴极暴露于2–5 ppm NO _2中导致高和低Pt样品的电化学面积（ECA）分别降低17–18％和21–23％，超过了参考测试中ECA的损失。纯净的空气。使用循环伏安法可以弥补中毒后1-2 ppm NO ₂引起的低Pt PEMFC性能损失。然而，5 ppm NO _2的中毒导致空间低Pt PEMFC性能降低10-70 mV。