A High Proton Conductive Hydrogen-Sulfate Decorated Titanium Carboxylate Metal−Organic Framework

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A hydrolytically stable titanium carboxylate-based metal−organic framework (MOF), incorporating hydrogen-sulfate functions bounded to Ti-metal sites and named MIP-177-SO 4 H-LT, was prepared using a green and simple synthesis protocol. This solid exhibits a very high proton conductivity of 2.6 × 10 –2 S cm –1 at 298 K and 95% relative humidity as evidenced by impedance spectroscopy measurements. This high level of performance maintained over 7 days combined with a very good chemical stability and green synthesis route positions this MOF as a promising candidate for further deployment as a proton-exchange membrane. Ab initio Molecular Dynamics simulations and advanced characterization tools (IR, UV–vis, TGA–MS) were further coupled to reveal a water-mediated proton transport Grotthuss-like mechanism.