质子交换膜燃料电池金属双极板表面改性涂层研究进展

用于质子交换膜燃料电池(PEMFC)的金属双极板，因其可加工性强、导热导电性优而受到广泛关注．作为燃料电池的重要组成部分,双极板的生产成本和性能是电堆投入实际应用、扩大应用范围的关键．金属双极板在PEMFC酸性且润湿的环境中，受到的侵蚀及其表面氧化带来的接触电阻的降低对其实际应用产生了挑战．本文简述了制备双极板表面改性涂层的方法，对比了用于极板改性的多类型涂层(金属基涂层、非晶碳涂层和氮化物涂层)在膜基结合力、界面导电性、耐腐蚀性能和疏水性等方面的差别,分析了改性涂层的腐蚀机制和影响涂层性能表现的因素，探讨了涂层在结构设计、失效机制、元素选择等方面存在的问题，讨论了降低极板成本、提高耐久性这一极板改性研究的主要趋势． 

Modified coatings on metal bipolar plates in proton exchange membrane fuel cells

Metal bipolar plates used in proton exchange membrane fuel cells (PEMFC) are under intensive study due to their excellent processability, good electroconductivity, and excellent thermal conductivity．Production cost and performance of bipolar plates are key to practical applications and to expand their application ranges．Erosion of metal bipolar plates in acidic and humid environment of PEMFC and reduction of contact resistance due to surface oxidation are challenges in their practical application．This paper reviews preparation methods of modified coatings．Coatings used for surface modification (metal-based coatings, amorphous carbon coatings and nitride coatings) are compared in their adhesion strength, interfacial conductivity, corrosion resistance and hydrophobicity．Corrosion mechanisms of modified coatings and factors affecting performance are analyzed．Difficulties in structural design, failure mechanism and element selection of coatings are examined．Reducing costs and improving durability should be emphasized in future research．