一种可用于金属双极板表面的MAX相薄膜材料

A kind of MAX phase thin-film material applied to surface of metal bipolar plates

M_(n+1)AX_n相(简称MAX相)金属陶瓷是一种新型三元化合物材料,综合了金属和陶瓷两种不同材料各自的优点,比如金属的高导电性和陶瓷的抗腐蚀,同时具有独特的层状结构削弱了陶瓷材料的脆性,使其具有良好的润滑性和机械加工性能。MAX相具有的优异性能主要由其结构所决定的,从理论上基于第一性原理的密度泛函理论平面波赝势法的计算结果和相对应的实验结果解释其高导电性,从电子结构解释其优异的抗腐蚀性能。这些性能都有利于改善金属双极板的抗腐蚀性和导电性,在商业化燃料电池中有应用前景。

MAX phase is a new ternary compound material that combines the advantages of both metals and ceramics, such as the high electrical conductivity of metals and the corrosion resistance of ceramics with a unique layered structure that weakens the brittle, so that it has good lubricity and machinability. The excellent performance of the MAX phase is mainly determined by its structure. From the theoretical results of the density functional theory (DFT) plane wave pseudopotential method and the corresponding experimental results, the high conductivity of the MAX phase was explained. From the electronic structure, its excellent corrosion resistance was described. These properties are of great benefit to improving the corrosion resistance and conductivity of the metal bipolar plate, which can promote the commercialization of the fuel cell.