Bipolar plates are the key component in polymer electrolyte membrane fuel cells (PEMFCs), which ensure the low cost of the fuel cell stack and furnish some of the important applications such as distributing the reactant gases, conducting the electrons, and removing the waste heat in PEMFCs. Thus, metallic bipolar plates (BPs), such as aluminum (Al), have attracted immense consideration and afford better performance in different machine‐driven applications and mass manufacturing opportunities. In order to increase the corrosion resistance of Al BPs, several methods are used and conducted by scientists. The corrosion behavior and surface structure analysis of pure Al were studied through the immersion process in fluoride‐sulfate solutions, assuming its use as BPs in PEMFC‐produced water. The open cell voltage, interfacial contact resistance, and polarization tests and the fuel cell operations were performed to evaluate cell voltage, current density, corrosion resistance, and the effect of fluoride and sulfate ions on the BPs in PEMFC. The hydrophobicity character of the surface of Al BPs was observed by the measurement of the wettability test. The atomic force microscopy images were taken to study the surface roughness, which was correlated with the corrosion rates of Al BPs. In addition, the amount of corrosion was calculated after 24–120 h of immersion in fluoride‐sulfate solutions. The scanning electron microscopy, transmission electron microscopy, and energy‐dispersive X‐ray spectroscopy data were analyzed to investigate the surface structure, morphology, and elemental analyses. Thus, the results found in this study revealed that Al‐based materials can be suitable for BPs in PEMFCs. Furthermore, it is noticed that the amount of corrosion was influenced by the presence of even a very small amount of fluoride ions present in the PEMFC environment, while it was suppressed efficiently by sulfate ions.

中文翻译：

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纯铝浸入模拟聚合物电解质膜燃料电池产水的氟化物硫酸盐溶液中的腐蚀行为和表面结构分析

双极板是聚合物电解质膜燃料电池（PEMFC）的关键部件，它确保了燃料电池堆的低成本，并提供了一些重要的应用，例如分配反应气体、传导电子以及去除电池中的废热。 PEMFC。因此，金属双极板（BP），例如铝（Al），引起了广泛的关注，并在不同的机器驱动应用和大规模制造机会中提供了更好的性能。为了提高 Al BP 的耐腐蚀性，科学家们使用并实施了多种方法。假设纯铝在 PEMFC 生产水中用作 BP，通过在氟化物硫酸盐溶液中的浸泡过程研究了纯铝的腐蚀行为和表面结构分析。进行开路电池电压、界面接触电阻、极化测试和燃料电池操作，以评估电池电压、电流密度、耐腐蚀性以及氟离子和硫酸根离子对 PEMFC 中 BP 的影响。通过润湿性测试的测量观察了Al BPs表面的疏水特性。拍摄原子力显微镜图像来研究表面粗糙度，这与 Al BP 的腐蚀速率相关。此外，计算在氟化物-硫酸盐溶液中浸泡 24-120 小时后的腐蚀量。对扫描电子显微镜、透射电子显微镜和能量色散X射线光谱数据进行分析，以研究表面结构、形态和元素分析。因此，本研究的结果表明，铝基材料可以适用于质子交换膜燃料电池中的BP。此外，值得注意的是，腐蚀量受到PEMFC环境中存在的甚至极少量的氟离子的影响，而硫酸根离子则有效地抑制了腐蚀量。