Multi-cation crosslinked anion exchange membranes from microporous Troger's base copolymers
Multi-cation crosslinked anion exchange membranes from microporous Troger's base copolymers
复制标题
由微孔 Troger 基础共聚物制成的多阳离子交联阴离子交换膜
DOI：
10.1039/c8ta02153h
复制
发表时间：
2018-07-21
影响因子：
11.9
通讯作者：
Liu, Qinglin
中科院分区：
文献类型：
--
作者：
Hu, Chuan;Zhang, Qiugen;Liu, Qinglin
固有微孔聚合物是近十年来备受关注的一类新型膜材料。但由于阴离子交换膜的溶解度差、易碎性差，在制备阴离子交换膜方面仍存在挑战。本文提出了一种合成可溶pim的新策略。通过结合两种Troger碱基的优点，合成的共聚物具有良好的溶解性和优异的力学性能。该共聚物在二甲基亚砜（DMSO）中具有良好的溶解性，经过少量季铵化反应，因此可以与长柔性多阳离子剂交联。所得膜具有良好的尺寸稳定性（60℃时溶胀率为20.8%）和优异的耐碱性。随后，该膜表现出103.9 mS cm(-1)（80℃）的高氢氧化物电导率，低离子交换容量（IEC）为1.67 meq g（-1）。此外，该膜在60℃下电流密度为330 mA cm（-2）时，在单个燃料电池中达到158 mW cm（-2）的峰值功率密度。该方法有利于开发高性能的基于pim的AEMs，并突出了多阳离子交联Troger's基AEMs在能源和分离领域广泛应用的巨大潜力。
Polymers of intrinsic microporosity (PIMs) represent a novel class of membrane materials attracting much attention over the past decade. But challenges still exist in the preparation of anion exchange membranes (AEMs) due to their poor solubility and brittleness. Here we present a new strategy to synthesize soluble PIMs for high performance AEMs. By combining merits of two Troger's base units, the synthesized copolymer exhibits good solubility as well as excellent mechanical properties. The copolymer has good solubility in dimethylsulfoxide (DMSO) after little quaternization and thus permits crosslinking with a long-flexible multi-cation agent. The resulting membrane has good dimensional stability (20.8% swelling ratio at 60 degrees C) and excellent alkaline resistance. Subsequently, this membrane exhibits a high hydroxide conductivity of 103.9 mS cm(-1) (80 degrees C) at a low ion exchange capacity (IEC) of 1.67 meq g(-1). Moreover, this membrane achieves a peak power density of 158 mW cm(-2) in a single fuel cell at a current density of 330 mA cm(-2) at 60 degrees C. The presented approach is beneficial for developing high performance PIM-based AEMs and highlights the tremendous potential of multi-cation cross-linked Troger's base AEMs for wide application in energy and separation fields.