This study aimed to investigate the effects of the operating conditions on the anisotropic electrical conductivity of diffusion layers in a polymer electrolyte membrane fuel cell. For this purpose, two different gas diffusion layers were considered. The electrical conductivity values of the selected gas diffusion layers in both in‐plane and through‐plane directions were examined experimentally, depending on cell temperature, relative humidity and clamping pressure. Resistance measurements were carried out for all combinations of operating conditions where cell temperature, relative humidity (RH) and clamping pressure were changed from 50 °C to 80 °C, from 70% to 100% and from 2 bars to 8 bars, respectively. The results showed that although the relative humidity had a dominant effect on the in‐plane conductivities for both the gas diffusion layers, it did not significantly affect the through‐plane conductivities. The through‐plane conductivities increased with the increase of the cell temperature and the clamping pressure, whereas the in‐plane conductivities did not remarkable change.

中文翻译：

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PEM燃料电池中工作条件对各向异性电导率影响的实验研究

本研究旨在研究操作条件对聚合物电解质膜燃料电池中扩散层各向异性电导率的影响。为此，考虑了两个不同的气体扩散层。根据电池温度，相对湿度和夹紧压力，通过实验检查了所选气体扩散层在面内和面内方向的电导率值。针对所有工作条件组合进行电阻测量，其中电池温度，相对湿度（RH）和夹紧压力分别从50°C更改为80°C，从70％更改为100％，从2 bar更改为8 bar。结果表明，尽管相对湿度对两个气体扩散层的面内电导率都有主要影响，它并没有显着影响贯穿平面的电导率。穿通电导率随电池温度和夹持压力的增加而增加，而穿入电导率则无明显变化。