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Superionic Conduction over a Wide Temperature Range in a Metal–Organic Framework Impregnated with Ionic Liquids
Author(s) -
Yoshida Yukihiro,
Fujie Kazuyuki,
Lim DaeWoon,
Ikeda Ryuichi,
Kitagawa Hiroshi
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201903980
Subject(s) - ionic liquid , fast ion conductor , ionic conductivity , electrolyte , conductivity , materials science , atmospheric temperature range , mesoporous material , thermal conduction , chemical physics , conductor , electrochemistry , ionic bonding , activation energy , chemical engineering , ion , chemistry , thermodynamics , electrode , organic chemistry , physics , engineering , composite material , catalysis
Most molecules in confined spaces show markedly different behaviors from those in the bulk. Large pores are composed of two regions: an interface region in which liquids interact with the pore surface, and a core region in which liquids behave as bulk. The realization of a highly mobile ionic liquid (IL) in a mesoporous metal–organic framework (MOF) is now reported. The hybrid shows a high room‐temperature conductivity (4.4×10 −3 S cm −1 ) and low activation energy (0.20 eV); both not only are among the best values reported for IL‐incorporated MOFs but also are classified as a superionic conductor. The conductivity reaches over 10 −2 S cm −1 above 343 K and follows the Vogel–Fulcher–Tammann equation up to ca. 400 K. In particular, the hybrid is advantageous at low temperatures (<263 K), where the ionic conduction is superior to that of bulk IL, making it useful as solid‐state electrolytes for electrochemical devices operating over a wide temperature range.