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Spatial performance of high- and low-Pt loaded proton exchange membrane fuel cells under cathode exposure to nitrogen dioxide
Journal of Power Sources ( IF 8.1 ) Pub Date : 2021-02-23 , DOI: 10.1016/j.jpowsour.2021.229657
Tatyana Reshetenko , Bonnie L. Ben

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.



中文翻译:

阴极暴露于二氧化氮下高和低铂负载质子交换膜燃料电池的空间性能

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。

更新日期:2021-02-23
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