Publication date: 10th April 2024
The synergy between ionic liquids (ILs) and metal-organic frameworks (MOFs) has attracted considerable scholarly attention as an innovative hybrid ionic conductor [1-2]. The incorporation of ionic liquids into the nanomaterial structure of MOFs has led to the successful synthesis of a novel solid electrolyte characterized by exceptional thermal stability and high ionic conductivity [3]. Here, we use an efficient capillary action method to introduce two proton conductive ionic liquids, namely 1-Ethyl-3-methylimidazolium triflate ([Emim][TfO]) and 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]), into the pores of ZIF-8, separately. Our investigation focuses on the influence of varying ILs quantities on pore volume, thermal stability, microstructure, and proton conductivity. The cages of ZIF-8 expand, and the decomposition temperature decreases following the encapsulation of ILs molecules. Notably, when the pores of the ZIF-8 material are entirely saturated with [Emim][TFSI], the composite material exhibits an impressive ionic conductivity of 1.140 mS·cm−1 (at 0 % RH and 180 °C). The activation energy for this particular composite is 0.25(4) eV, which is notably low when compared to other IL@MOF conductive composites. These findings underscore the significant promise of IL@MOF hybrid composites as potential ionic conductors, attributable to their elevated electrical conductivity and relatively low activation energy. Additional, this composite can be used as electrolytes of High-Temperature Proton Exchange Membrane Fuel Cells, which are a type of fuel cell that operates at higher temperatures compared to traditional proton exchange membrane fuel cells (PEMFCs).
Literature:
[1] J. Jia et al, ACS Sustain. Chem. Eng. 2023, 11, 13502-13507. [2] A. B. Kanj et al, Nano Lett. 2019, 19, 2114-2120. [3] W. L. Xue et al, Angew. Chem. Int. Ed. Engl. 2021, 60, 1290-1297.
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