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Article Dans Une Revue Journal of the American Chemical Society Année : 2018

Achieving Superprotonic Conduction with a 2D Fluorinated Metal–Organic Framework

Résumé

A hydrolytically stable metal–organic framework (MOF) material, named KAUST-7′, was derived from a structural phase change of KAUST-7 upon exposure to conditions akin to protonic conduction (363 K/95% relative humidity). KAUST 7′ exhibited a superprotonic conductivity as evidenced by the impedance spectroscopic measurement revealing an exceptional conductivity up to 2.0 × 10–2 S cm–1 at 363 K and under 95% RH, a performance maintained over 7 days. Ab initio molecular dynamics simulations suggested that the water-mediated proton transport mechanism is governed by water assisted reorganization of the H-bond network involving the fluorine moieties in KAUST-7′ and the guest water molecules. The notable level of performances combined with a very good hydrolytic stability positions KAUST-7′ as a prospective proton-exchange membrane alternative to the commercial benchmark Nafion. Furthermore, the remarkable RH sensitivity of KAUST-7′ conductivity, substantially higher than previously reported MOFs, offers great opportunities for deployment as a humidity sensor.

Domaines

Chimie

Dates et versions

hal-01913706 , version 1 (06-11-2018)

Identifiants

Citer

Paulo Mileo, Karim Adil, Louisa Davis, Amandine Cadiau, Youssef Belmabkhout, et al.. Achieving Superprotonic Conduction with a 2D Fluorinated Metal–Organic Framework. Journal of the American Chemical Society, 2018, 140 (41), pp.13156 - 13160. ⟨10.1021/jacs.8b06582⟩. ⟨hal-01913706⟩
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