High Proton Conductivity of the UiO-66-NH 2 -SPES Composite Membrane Prepared by Covalent Cross-Linking

作者：Yuanyuan Xing, Jiao Wang, Chenxi Zhang, Qing‐Lun Wang · 发表于：ACS Applied Materials & Interfaces · 年份：2023 · DOI：10.1021/acsami.3c06630 · 被引用次数：36 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Fuel Cells and Related Materials、Covalent Organic Framework Applications

A sulfonated poly(ethersulfone) (SPES)–metal–organic framework (MOF) film with excellent proton conductivity was synthesized by anchoring UiO-66-NH 2 to the main chain of the aromatic polymer through the Hinsberg reaction. The chemical bond was formed between the amino group in MOFs and the −SO 2 Cl group in chlorosulfonated poly(ethersulfones) to conduct protons in the proton channel of the membrane, making the membrane have excellent proton conductivity. UiO-66-NH 2 is successfully prepared as a result of the consistency of the experimental and simulated powder X-ray diffraction (PXRD) patterns of MOFs. The existence of absorption peaks of characteristic functional groups in Fourier transform infrared (FTIR) spectra proved the successful preparation of SPES, PES–SO 2 Cl, and a composite film. The results of the AC impedance test indicate that the composite film with a 3% mass fraction has the best proton conductivity of 0.215 S·cm –1, which is 6.2 times higher than that of the blended film without a chemical bond at 98% RH and 353 K. To our knowledge, there are rarely any reports on the preparation of a composite membrane by directly linking MOFs and the membrane matrix with chemical bonds. This work provides a good way to synthesize the highly conductive proton exchange film.