石墨／聚丙烯复合板与碳纸间的接触电阻

On the contact resistance between graphite/polypropylene 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／聚丙烯树脂复合板,研究了接触 压力、聚丙烯树脂含量、熔融流体指数(MFI)和模压工艺条件对复合板与碳纸间接触电阻的影响．结果表 明,复合板中石墨与碳纸间所形成的接触点数目是决定接触电阻大小的重要因素．接触压力的增大使石墨与 碳纸间接触点的数目增大,导致接触电阻减小．而随着聚丙烯树脂含量的增加,接触电阻增大．随着MFI 值的增大,模压压力的增大和模压温度的升高,接触电阻都缓慢增大．

Graphite/polypropylene （PP） composite bipolar plates applied for polymer electrolyte membrane fuel cells （PEMFCs） have been prepared by a compression molding process. The influences of contacting pressure, PP content, PP melting flow rate （MFI） and compression molding parameters on the contact resistance between the composite plate and carbon paper were investigated. Results show that the contact resistance decreases greatly with the increase of the contacting pressure and increases with increasing PP content evidently. The MFI, compression pressure and temperature have a less influence on the contact resistance compared with contacting pressure and PP content. The contact resistance increases slightly with the increase of MFI, compression pressure and temperature.