高性能三磺化聚芳醚氧膦质子交换膜的结构设计、制备与性能

Trisulfonated poly(arylene ether phosphine oxide)s were developed by our group for proton exchange membranes (PEMs), which exhibited excellent overall properties because of their particular hydrophilic/hydrophobic micro-phase separated structures. On this base, the methanol permeability of resulting PEMs could be reduced and their overall properties could be optimized and further improved via incorporation of novel powerful intermolecular interactions or innovation of cross-linking approaches. Thus these PEMs were expected to be qualified as the membrane of direct methanol fuel cells. The corresponding findings could facilitate to obtain the exciting approaches for fabricating aromatic PEMs with high performance.

本课题组开创了三磺化聚芳醚氧膦质子交换膜，它具有独特的亲水/疏水微相分离结构，综合性能优良。在此基础上，本项目通过引入新型强分子间作用力或创新交联方法来降低甲醇渗透率，优化并提高综合性能，以期制备能在直接甲醇燃料电池中应用的质子交换膜，并为制备高性能芳香质子交换膜提供新方法。

氢气的存储与运输是质子交换膜燃料电池商业化的瓶颈之一。甲醇来源丰富，存储与运输方便，因此直接甲醇燃料电池（DMFCs）是质子交换膜燃料电池的替代方案之一。常用的Nafion全氟质子交换膜的甲醇渗透率高，难以应用于DMFCs。.本项目从分子设计着手，合成并优化三磺化聚芳醚氧膦质子交换膜的结构，并采用新型交联方法，降低了甲醇渗透率，提高了质子电导率，综合性能优良，为制备综合性能优异的非氟质子交换膜提供了新方法。三磺化聚芳醚氧膦质子交换膜的溶胀率远低于Nafion 117的溶胀率、质子电导率为Nafion 117的1.3倍，甲醇渗透率仅为Nafion 117 的1/8，热稳定性高，力学性能好，耐氧化性能优异，可望应用于直接甲醇燃料电池。