Construction of effective transmission channels by anchoring metal‐organic framework on side‐chain sulfonated poly(arylene ether ketone sulfone) for fuel cells

Abstract

A series of novel organic-inorganic hybrid membranes assembled by side-chain type sulfonated poly(arylene ether ketone sulfone) with amino groups (Am-SPAEKS-DBS) and ZIF-67 were prepared. Am-SPAEKS-DBS containing double bonds was synthesized by condensation polymerization, and the AMPS was grafted onto the main chain by post sulfonation. ZIF-67 was prepared by an ordinary solvent method. The structures of ZIF-67, Am-SPAEKS-DBS, and hybrid membranes were analyzed by proton nuclear magnetic resonance (1H NMR), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and Fourier transform infrared (FT-IR). All hybrid membranes had good dimensional stability and excellent oxidation stability. In addition, the swelling ratios of all hybrid membranes were low (<17.46%) at even 100°C, and the oxidative stability was higher than 92%. The proton conductivities of this series of membranes were much higher (0.0540.069 S cm−1 at 30°C, 0.088-0.116 S cm−1 at 80°C) than pure membrane (0.038 S cm−1 at 30°C, 0.076 S cm−1 at 80°C). The experimental results exhibited that the comprehensive properties of hybrid membranes are good, and hybrid membranes had substantially possible as proton exchange membranes. Highlights Metal-organic frameworks were anchored on side-chain type organic polymer backbone. The hybrid PEMs showed good dimensional stability and excellent oxidation stability. The imidazole as a ligand in ZIF-67 contributes a part of the dissociated protons.