【摘要】 质子交换膜燃料电池(PEMFC)的膜电极(MEA)由质子交换膜、催化层、水管理层(WML)和扩散层组成。研究了WML的厚度和聚四氟乙烯(PTFE)的含量对膜电极性能的影响,并采用了两种新型造孔剂(碳酸氢铵和硫酸铵)优化WML的孔结构。采用环境扫描电镜(ESEM)表征了膜电极的表面形貌和孔结构;采用单体PEMFC的电流密度-电压曲线评价了膜电极在外增湿和自增湿方式下的极化特性,结果表明,WML的建立提高了膜电极的水管理能力,使膜电极在自增湿方式下具有良好的极化特性。更多还原

【Abstract】 The membrane electrode assembly（MEA） in proton exchange membrane fuel cell（PEMFC） was composed of the proton exchange membrane,catalyst layer,water management layer（WML） and diffusion layer.The influence of the thickness and polytetrafluoroethylene（PTFE） content of WML on the performance of MEAs was studied.Two kinds of new pore-forming agents,NH₄HCO₃ and（NH₄）₂SO₄,were used to optimize the pore structure of WML.The pore structure and surface appearance of WML were investigated by the environmental scanning electron microscopy（ESEM） method.I-V characteristic of the MEA was tested under conditions of the external humidification and self-humidification.The results showed that the MEA with WWL exhibited a better ability of water management and an improved I-V characteristic under conditions of self-humidification.更多还原