阻醇膜及阴极PTFE含量对被动式DMFC的影响

Effect of methanol resistance membrane and PTFE content in cathode on passive DMFC

研究了聚吡咯（PPy）/Nafion膜及阴极聚四氟乙烯（PTFE）含量对被动式直接甲醇燃料电池（DMFC）性能的影响。随着聚合时间的延长，PPy/Nafion膜的吸水率逐渐减小、质子导电率下降。当温度为25～30℃，空气湿度为80％～85％时，聚合35 min的PPy/Nafion膜组装的被动式 DMFC 电池性能最好，最大功率密度比未修饰的 Nafion 膜组装的电池提高18.9％；阴极含30％ PTFE的电池性能最好，功率密度最高达14.74 mW/cm2。

Effects of polypyrrole（PPy）/Nafion membrane and polytetrafluoroethylene（PTFE）content in the cathode backing layer were investigated. The proton conductivity and water uptake of Nafion membranes decreased with increasing polymerization time of pyrrole. The power density of passive direct methanol fuel cell using the PPy/Nafion membrane which polymerization time of 35 min was 18.9% higher than the one with untreated Nafion membrane,at 25 ~30 ℃ and relative moisture at 80%~85%. The optimal value of PTFE content in cathode was 30%. The highest power density of 14.74 mW/cm2 was achieved in a passive DMFC opera-ting with neat methanol.