通过测定甲醇渗透率,详细研究了阳极支撑层的聚四氟乙烯(PTFE)含量对全被动式直接甲醇燃料电池(DMFC)甲醇传质和电池性能的影响.膜电极集合体均使用相同的阳极催化层,膜和阴极.实验结果表明,随着阳极支撑层PTFE含量的提高,甲醇渗透速率明显减小.其含量较高时,甲醇传质阻力较大,会导致电池在很低的电流密度下就出现传质控制区.采用PTFE质量分数为40％的支撑层时,DMFC以9 mol/L甲醇为燃料最大功率密度可达32×10-3 W/cm2,也进一步证明了适当提高阳极支撑层的憎水性,既有助于减少甲醇的渗透,又缓解了阴极的“水淹”问题.
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