石墨/高铝水泥模压复合材料双极板的特性

Characteristics of graphite/aluminate cement mold pressing composite bipolar plate

采用高铝水泥作为粘结剂,石墨作为导电填料,通过室温模压的方法制备了导电复合材料,拟用于制作质子交换膜燃料电池的双极板。对石墨/高铝水泥复合材料双极板的电性能和力学性能的影响因数进行了分析和评价,并测量了该复合材料双极板的含水量、凝胶毛细孔尺寸分布和氢气渗透性。实验结果表明:含有60 wt%石墨的石墨/高铝水泥模压复合材料双极板的电导率和力学强度基本上可以同时满足质子交换膜燃料电池的使用要求;并且该复合材料双极板含有凝胶毛细孔,约具有7 wt%的含水量,具有自增湿功能;此外,氢气渗透率也较低。

Graphite/aluminate cement conductive composites, which will be used as the bipolar plate of proton exchange membrane fuel cell （PEMFC）, were prepared by mold pressing at room temperature. The effect factors of graphite/aluminate cement composite bipolar plate on the electrical conductivity and the flexural strength were investigated and discussed. The water content, gel capillary pore size and distribution and H2 permeability of composite bipolar plate composites were measured. The test results show that the conductivity and the flexural strength of the composite bipolar plate can meet the PEMFC requirements when the graphite content is 60 wt%. The composite bipolar plate contains capillary pores and the water content of the composite bipolar plate is about 7 wt%, which is different from other composite bipolar plates. Therefore, it possesses self-humidifying function during the operating process of the fuel cell. In addition, H2 permeability of the composite bipolar plate is little.