PEMFC用聚丙烯/酚醛树脂/石墨复合双极板研究

Study on polypropylene/phenolic resin/natural flake graphite composite bipolar plates for PEMFC

以聚丙烯(PP)、酚醛树脂(PF)、天然鳞片石墨(NG)为原料,通过模压工艺制备了质子交换膜燃料电池用复合双极板。研究了聚丙烯质量分数、模压温度、模压压力、保压时间,酚醛树脂加入量对复合板的电导率、抗弯强度、接触电阻等参数的影响。实验结果表明随着聚丙烯含量的增加,复合板的机械性能提高,电导率下降;酚醛树脂的加入可以大幅度提高复合板的抗弯强度;此外,模压温度的升高、模压压力的增加均有利于复合板的抗弯强度;当石墨质量分数为80%,树脂质量分数为20%,其中PF与PP质量比为2∶1时,复合板具有最佳的综合性能。

Composite bipolar plates for proton exchange membrane fuel cells were fabricated from polypropylene (PP), phenolic resin (PF) and natural flake graphite (NG) by compression molding. The effects of polypropylene mass fraction, molding temperature, molding pressure, holding time and the phenolic resin content on electrical conductivity, bending strength and contact resistance of the composite board were studied. The experimental results indicated that with the increasing of the polypropylene content, the mechanical properties of composite bipolar plate was improved, but the electrical conductivity of composite bipolar plate was decreased. The addition of phenolic resin could improve the bending strength of the composite board greatly. In addition, the increase of molding temperature and molding pressure are beneficial to the bending strength of the bipolar plate. When the mass fraction of graphite was 80%, the mass fraction of resin was 20%, and the mass ratio of PF∶PP was 2∶1, the composite bipolar plates had favorable comprehensive properties.