Guest-Assisted Proton Conduction in the Sulfonic Mesoporous MIL-101 MOF

Sabine Devautour-Vinot; Eriyakkadan S Sanil; Amine Geneste; Vanessa Ortiz; Pascal G Yot; Jong-San Chang; Guillaume Maurin

doi:10.1002/asia.201900608

Guest-Assisted Proton Conduction in the Sulfonic Mesoporous MIL-101 MOF

Chem Asian J. 2019 Oct 15;14(20):3561-3565. doi: 10.1002/asia.201900608. Epub 2019 Jun 26.

Authors

Sabine Devautour-Vinot¹, Eriyakkadan S Sanil², Amine Geneste¹, Vanessa Ortiz¹, Pascal G Yot¹, Jong-San Chang^{2

3}, Guillaume Maurin¹

Affiliations

¹ Institut Charles Gerhardt Montpellier, UMR 5253 CNRS UM ENSCM, Université Montpellier, Pl. E. Bataillon, 34095, Montpellier cedex 05, France.
² Research Group for Nanocatalyst, Korea Research Institute of Chemical Technology (KRICT), Gajeongro 141, Yuseong, Daejeon, 305-606, South Korea.
³ Department of Chemistry, Sungkyunkwan University, Suwon, 440-476, South Korea.

PMID: 31125184
DOI: 10.1002/asia.201900608

Abstract

Post-synthesis modification of MIL-101(Cr)-NO₂ was explored in order to decorate the organic backbone by propyl-sulfonic groups, with the aim to incorporate mobile and acidic protons for solid-state proton electrolyte applications. The resulting solid switched from insulating towards proton superconductive behavior under humidity, while the conductivity recorded at 363 K and 95 % relative humidity reached 4.8×10^-3 S cm^-1 . Propitiously, the impregnation of the material by strong acidic molecules (H₂ SO₄ ) further boosted the proton conductivity performances up to the remarkable σ value of 1.3×10^-1 S cm^-1 at 363 K/95 % RH, which reaches the performances of the best proton conductive MOF reported so far.

Keywords: Grotthus mechanism; post-synthesis modification; proton conduction; sulfonic MOF; water and sulfuric acid-mediated proton migration.