PEMFC用石墨／酚醛树脂复合板的膨胀石墨表面改性

Surface modification of graphite/phenolic resin composite plates with expanded graphite for PEMFC

提出采用膨胀石墨对石墨/酚醛树脂复合板进行表面改性,改性后复合板的体积电阻和接触电阻都有显著降低。考察了膨胀石墨的膨胀体积、膨胀石墨层厚度等因素对膨胀石墨改性复合板的接触电阻和体积电阻的影响。结果表明,膨胀石墨的膨胀体积是影响膨胀石墨改性复合板体积电阻和接触电阻的重要因素。随膨胀石墨层厚度增加,接触电阻先减小而后趋于不变。复合板中酚醛树脂含量越高,采用膨胀石墨表面改性对降低复合板的体积电阻和接触电阻的效果越显著。

Surface modification of graphite/phenolic resin （PF） composite plates with expanded graphite （EG） was studied in this paper. Both volume resistance and contact resistance of the modified composite bipolar plates decreasd obviously after modification. The effects of expanded volume and thickness of EG on volume resistance and contact resistance were investigated. The results showed that the expanded volume of EG was an important factor that influenced the volume resistance and contact resistance of modified composite plates. Contact resistance decreased at first and then tended to become unchanged with the increase of the thickness of EG. The reduction of contact resistance and volume resistance became even more remarkable with the increase of PF content in the modified composite plates.