多孔有机笼在聚丙烯腈纳米纤维表面固载及其复合质子交换膜

质子交换膜（PEM）是质子交换膜燃料电池的核心部件，需具备选择性地快速传递质子的特性。多孔有机笼具有高比表面积、良好的化学稳定性和高吸水特性以及三维连通的质子传递路径，可提升PEM的质子传导性能。本文将多孔有机笼（CC3）原位固载到聚丙烯腈（PAN）纳米纤维表面，与Nafion复合制备了CC3/PAN-Nafion复合质子交换膜，对其结构和性能进行了研究，结果表明：CC3的固载改变了纤维的微观形貌，增加了纤维直径，使纳米纤维比表面积从9.57m²/g增加到113.6m²/g；将CC3/PAN引入复合膜显著提升了CC3/PAN-Nafion的热稳定性、吸水性、阻醇性以及质子传导性能，其中CC3/PAN-Nafion12在100%RH，80℃时质子传导率可达0.165S/cm，较Nafion膜提升了一倍。

Preparation and performance of CC3 immobilized PAN nanofibers and its modified Nafion hybrid proton exchange membrane

Proton exchange membrane (PEM) as the key component of a proton exchange membrane fuel cell is required to selectively and fast transport protons. The porous organic cage has a high specific surface area, good chemical stability, high water absorption and a three-dimensional connected proton transport path, which is expected to improve the proton conductivity of PEM. In this work, the porous organic cage 3 (CC3) molecules were immobilized on the surface of polyacrylonitrile (PAN) nanofibers by in situ growth method, and then a hybrid proton exchange membrane was prepared by impregnation with Nafion membrane solution. In this work, a hybrid proton exchange membrane was prepared by immobilizing CC3 onto the surface of PAN nanofibers followed by impregnation with Nafion membrane. The results of structure and performance studies showed that CC3 was successfully immobilized on the surface of PAN nanofibers by step reaction, and the specific surface area was thus increased to 113.6m²/g from 9.57m²/g. The introduction of CC3/PAN into the composite membrane significantly improved the thermal stability, water absorption and alcohol resistance of CC3/PAN-Nafion. Among them, the proton conductivity of CC3/PAN-Nafion12 can reach 0.165S/cm at 100% RH and 80℃, which was 100% higher than Nafion.