As the key sealing part of proton exchange membrane fuel cell (PEMFC), the gasket is easily damaged in acidic solution and wet air for a long time in PEMFC, resulting in unsafe and unstable operation of PEMFC. In this paper, the regular solution (RS) and accelerated durability test (ADT) solution in PEMFC were prepared to study the aging damage process of silicone rubber gasket, and the attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR) was used to analyze the surface changes of gaskets soaked in solutions. The results showed that the weight loss of samples increased with the soaking time in both ADT solution and RS solution, and the damage of samples in ADT solution was faster and more serious than that in RS solution. Meanwhile, the microstructure diagram also indicated that the damage of the samples in ADT solution was more serious than that in the RS solution. The ATR-FTIR analysis results showed that the intensity of characteristic wave peaks of samples at 706, 787, 867, 1006, 1071, 1260, and 2961cm⁻¹ in ADT solution decreased faster than that in RS solution, which was consistent with the results of weight analysis and microstructure analysis.

中文翻译：

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质子交换膜燃料电池密封垫的化学老化

垫片作为质子交换膜燃料电池（PEMFC）的关键密封件，在PEMFC中长期处于酸性溶液和潮湿空气中容易损坏，导致PEMFC运行不安全、不稳定。本文通过制备PEMFC中的常规溶液（RS）和加速耐久性试验（ADT）溶液研究硅橡胶垫片的老化损伤过程，并利用衰减全反射傅立叶变换红外光谱仪（ATR-FTIR）对硅橡胶垫片的老化损伤过程进行了研究。分析浸泡在溶液中的垫片的表面变化。结果表明，在ADT溶液和RS溶液中，样品的失重均随着浸泡时间的延长而增加，且样品在ADT溶液中的损伤比在RS溶液中更快、更严重。同时，微观结构图还表明样品在ADT溶液中的损伤比在RS溶液中更严重。ATR-FTIR分析结果表明，样品在706、787、867、1006、1071、1260和2961cm处的特征波峰强度^-1在ADT溶液中比在RS溶液中下降得更快，这与重量分析和微观结构分析的结果一致。