Authors
Wen Yang, Christian Rodenbücher, Sylvio Indris, Benjamin Klingebiel, Mareen Schaller, Nan Sun, Jiangshui Luo, Carsten Korte
Published in
Small (Weinheim an der Bergstrasse, Germany). Pages e76019. Sep 27, 2026. Epub Sep 27, 2026.
Abstract
The synergy between ionic liquids (ILs) and metal-organic frameworks (MOFs) has attracted considerable attention because of future applications as a tailor-made hybrid ionic conductor. The incorporation of ILs into MOFs cages has led to the development of a novel type of solid electrolytes (ILs@MOF), characterized by exceptional thermal stability and high conductivity for large ionic species. In this study, an efficient capillary method was employed to introduce a classical protic IL, [Dema][TfO], into ZIF-8 pores, consisting of sodalite-type cages (Zn(MeIm)2). Our investigation focuses on the influence of varying ILs content on the free (pore) volume, thermal stability, microstructure, and ionic conductivity. The uptake of [Dema][TfO] results in a ZIF-8 cage expansion, accompanied by a decrease of the decomposition temperature. Upon infiltration of [Dema][TfO] into the ZIF-8 pores, the preexisting hydrogen bonds within the IL are broken due to confinement effects. Notably, when ZIF-8 pores are entirely saturated with [Dema][TfO], the composite material exhibits an ionic conductivity of 1.09(6) mS·cm-1 (at 160°C under anhydrous conditions) with an activation energy of 0.45(3) eV, which is better than other ILs@MOF conductive composites. These findings reveal ILs@MOF hybrid composites are versatile systems to compose protic conductors, attributable to their elevated ionic conductivity.
PMID:
42801488
Bibliographic data and abstract were imported from PubMed on 28 Sep 2026.
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