Rigid crosslinkers towards constructing highly-efficient ion transport channels in anion exchange membranes
Rigid crosslinkers towards constructing highly-efficient ion transport channels in anion exchange membranes
复制标题
刚性交联剂在阴离子交换膜中构建高效离子传输通道
DOI：
10.1016/j.memsci.2020.118806
复制
发表时间：
2021
影响因子：
9.5
通讯作者：
Qinglin Liu
中科院分区：
文献类型：
--
作者：
Chuan Hu;Xuecheng Dong;Yanzhen Hong;Qiugen Zhang;Xiuli Deng;Qinglin Liu
合成阴离子交换膜(AEMS)通常存在电导率低、碱稳定性差、尺寸稳定性差等问题。构建高效的离子传输通道被认为是制备高电导率、低溶胀比AEMS的最有效途径之一。在这里，我们展示了一种简单的策略来实现这一目标，通过使用刚性交联剂来扩大聚合物链的链间间距。选用三种交联剂对聚醚酮(PEK)AEMS进行改性。与柔性交联剂的AEM相比，刚性交联剂的AEM具有更有效的离子传输通道，因此表现出更高的吸水率和离子电导率。尤其是用长刚性交联剂取代柔性短交联剂后，在80℃时，AEM的氢氧化物电导率从63.2ms/cm−1提高到110.3×10~3。同时，膨胀率(SR)小于25%。刚性交联剂应有利于构建高效的离子通道，克服合成AEMS的离子导电性和尺寸稳定性之间的权衡关系。
Synthetic anion exchange membranes (AEMs) usually suffer from low conductivity, bad alkaline stability and poor dimensional stability. Constructing efficient ion transport channels is considered to be one of the most effective ways for preparing the AEMs with the high conductivity and low swelling ratio. Herein we demonstrate a facile strategy to achieve this goalviausing the rigid crosslinkers to expend the interchain spacing of polymer chains. Three crosslinkers are chose to modify poly (ether ketone) (PEK) AEMs. The AEMs with rigid crosslinkers have more efficient ion transport channels and thus show both higher water uptake and higher ionic conductivity, compared with the AEM with the flexible crosslinker. Especially, the hydroxide conductivity of the AEM increases from 63.2 to 110.3 mS cm−1at 80 °C when the short flexible crosslinker is replaced by the long rigid crosslinker. Meanwhile, the swelling ratios (SR) are less than 25%. The rigid crosslinkers should be beneficial to construct efficient ion channel and overcome the trade-off relation between the ionic conductivity and dimensional stability of the synthetic AEMs.