石墨/酚醛树脂复合板与碳纸间接触电阻

Contact resistance between graphite/phenolic resin composite plate and carbon paper

应用模压工艺制备了质子交换膜燃料电池(PEMFC)用石墨/酚醛树脂(PF)复合板.通过四电极法测量了复合板与碳纸间的接触电阻.考察了接触压力、PF树脂含量及模压工艺条件对接触电阻的影响.结果表明,接触压力和PF树脂含量是对接触电阻有较大程度影响的两个重要因素.接触压力的增大导致接触电阻迅速减小,而随着PF树脂含量的增加,接触电阻有着非常快的增加趋势.模压压力对接触电阻已有一定程度的影响,但其影响幅度不如接触压力和树脂含量那么大.随着模压压力的增大,接触电阻的增加趋势比较缓慢.模压时间和模压温度对接触电阻基本没有影响.

Graphite/phenolic resin （PF） composite bipolar plates used for polymer electrolyte membrane fuel cells （PEMFCs） were prepared by a compression molding process. The contact resistance between the composite plates and carbon paper were measured with a four-probe method. The influences of contacting pressure, PF content and compression molding parameters on the contact resistance were investigated. The results show that contacting pressure and PF content had a great influence on contact resistance. The contact resistance decreased with the increase of contacting pressure and increased with increasing PF content evidently. The compression pressure and temperature had a smaller influence on contact resistance compared with contacting pressure and PF content. The contact resistance increases slightly with increasing compression pressure. The compression time and temperature had no effect on contact resistance.