▎ 摘　　要

This research respectively adds different proportions of Se catalyst, graphene and the mixture of Se catalyst and graphene to PDMS (Polydimethylsiloxane) fuel channel to discuss the effect of graphene powders and the mixture of Se catalyst and graphene on power generation efficiency of DMFCs. Respectively coating Se catalyst and graphene powders to fuel channel of fuel cells can promote the electrochemical reaction and be beneficial to the removal of CO2 bubbles on anodic flow channel to improve the power generation efficiency of DMFC. However, the adding percentages of Se catalyst and graphene powers have their corresponding critical adding percentage values under different operational conditions. When the adding percentage of Se catalyst and graphene powers equals the critical value, the performance of DMFC can be enhanced to the maximum degree. With the increase in operational temperature, the critical value of adding percentage of Se catalyst and graphene powers will decrease accordingly to avoid the cross over situation of DMFC. But compared with Se catalyst, the effect of coating graphene powers on the fuel channel plate to enhance the power generation of DMFC is not apparent, and its maximum power density can be enhanced by 3%similar to 12%. According to the results, the adding weight percentage of the mixture of Se catalyst and graphene also has the best critical proportion value. Compared with DMFC where the critical value of Se catalyst has been added on the fuel channel plate, adding graphene powders on flow channel will possibly cause the cross over problem of fuel cells. Thus, it is not necessarily conducive to the enhancement of power generation efficiency of DMFC.