Covalent organic frameworks (COFs) have been considered promising hydroxide-conducting materials for their highly ordered crystalline porous structure and tunable functionality. However, the lack of hydroxyl conduction functional groups on the COFs frameworks restricts their further development in anion exchange membrane fuel cells (AEMFCs). At present, impregnated ionic liquids (ILs) are mainly used to solve this problem, but they still face the challenge of ILs leakage under working conditions. Here, we report a novel IL-functionalized covalent organic framework (IL-COF), which is prepared by grafting guanidinium-based IL onto the channel walls of COF via the Williamson ether reaction and then doped into guanidinium-functionalized poly(2,6-dimethyl-1,4-phenylene oxide) (GPPO) to prepare IL-COF/GPPO composite membranes. The ILs grafted into the COFs nanochannels act as the “active sites” in the membranes to enhance the migration rate of the hydroxide ions and thus improve the conductivity. Accordingly, the hydroxide conductivity of the resultant IL-COF/GPPO composite membrane with IL-COF doping amount of 5 wt% can reach up to 89.93 mS cm⁻¹ at 80 °C under hydrated condition, 61% higher than that of the pristine GPPO membrane. Meanwhile, its hydroxide conductivity retains 90.31% after alkaline treatment for 14 days. Compared with IL-impregnated COF composite membrane (IL@COF/GPPO), IL-COF/GPPO membrane has superior hydroxyl conductivity and long-term stability since chemical grafting can more firmly immobilize ILs into COF channels than impregnation.

共价有机框架 (COF) 因其高度有序的晶体多孔结构和可调节的功能而被认为是有前途的氢氧化物导电材料。然而，COFs框架上缺乏羟基传导官能团限制了它们在阴离子交换膜燃料电池（AEMFCs）中的进一步发展。目前主要采用浸渍离子液体（ILs）来解决这一问题，但在工作条件下仍面临ILs泄漏的挑战。在这里，我们报告了一种新型的 IL 功能化共价有机框架 (IL-COF)，它是通过将胍基 IL 接枝到 COF 的通道壁上而制备的。威廉姆森醚反应后掺杂到胍基官能化聚(2,6-二甲基-1,4-苯醚)(GPPO)中制备IL-COF/GPPO复合膜。接枝到 COF 纳米通道中的离子液体充当膜中的“活性位点”，以提高氢氧根离子的迁移速率，从而提高电导率。因此，IL-COF掺杂量为5 wt%的IL-COF/GPPO复合膜的氢氧化物电导率可达89.93 mS cm ^-1在 80 °C 的水合条件下，比原始 GPPO 膜高 61%。同时，碱处理14天后，其氢氧化物电导率仍保持在90.31%。与 IL 浸渍的 COF 复合膜 (IL@COF/GPPO) 相比，IL-COF/GPPO 膜具有优异的羟基电导率和长期稳定性，因为化学接枝可以比浸渍更牢固地将 IL 固定在 COF 通道中。