Two materials, polyaniline (PANI) and titanium nitride (TiN), used for bipolar plate (BPP) coatings have each shown promise in improving the corrosion resistance and contact resistance, respectively, of metallic bipolar plates. Polyaniline was shown to provide a barrier for the bipolar plate and to effectively lower the corrosion currents observed in ex situ corrosion tests. However, the interfacial contact resistance (ICR) between polyaniline coatings and gas diffusion layer (GDL) is high and results in high electrical losses. On the other hand, TiN is reported to achieve good conductivity and in some cases improved corrosion resistance.

中文翻译：

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用于聚合物电解质燃料电池的金属双极板的氮化钛聚苯胺双层涂层

用于双极板（BPP）涂层的两种材料，聚苯胺（PANI）和氮化钛（TiN），已分别显示出有望改善金属双极板的耐腐蚀性和接触电阻。聚苯胺被证明为双极板提供了屏障，并有效降低了在非原位腐蚀试验中观察到的腐蚀电流。但是，聚苯胺涂层和气体扩散层（GDL）之间的界面接触电阻（ICR）高，并导致高电损耗。另一方面，据报道，TiN具有良好的导电性，在某些情况下还提高了耐腐蚀性。