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Comparison of the ionic conductivity properties of microporous and mesoporous MOFs infiltrated with a Na-ion containing IL mixture

Joshua M. Tuffnell Orcid Logo, Jędrzej K. Morzy Orcid Logo, Nicola D. Kelly Orcid Logo, Rui Tan Orcid Logo, Qilei Song Orcid Logo, Caterina Ducati Orcid Logo, Thomas D. Bennett Orcid Logo, Siân E. Dutton Orcid Logo

Dalton Transactions, Volume: 49, Issue: 44, Pages: 15914 - 15924

Swansea University Author: Rui Tan Orcid Logo

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DOI (Published version): 10.1039/d0dt02576c

Abstract

IL@MOF (IL: ionic liquid; MOF: metal–organic framework) materials have been proposed as a candidate for solid-state electrolytes, combining the inherent non-flammability and high thermal and chemical stability of the ionic liquid with the host–guest interactions of the MOF. In this work, we compare...

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Published in: Dalton Transactions
ISSN: 1477-9226 1477-9234
Published: Royal Society of Chemistry (RSC) 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa67812
Abstract: IL@MOF (IL: ionic liquid; MOF: metal–organic framework) materials have been proposed as a candidate for solid-state electrolytes, combining the inherent non-flammability and high thermal and chemical stability of the ionic liquid with the host–guest interactions of the MOF. In this work, we compare the structure and ionic conductivity of a sodium ion containing IL@MOF composite formed from a microcrystalline powder of the zeolitic imidazolate framework (ZIF), ZIF-8 with a hierarchically porous sample of ZIF-8 containing both micro- and mesopores from a sol–gel synthesis. Although the crystallographic structures were shown to be the same by X-ray diffraction, significant differences in particle size, packing and morphology were identified by electron microscopy techniques which highlight the origins of the hierarchical porosity. After incorporation of Na0.1EMIM0.9TFSI (abbreviated to NaIL; EMIM = 1-ethyl-3-methylimidazolium; TFSI = bis(trifluoromethylsulfonyl)imide), the hierarchically porous composite exhibited a 40% greater filling capacity than the purely microporous sample which was confirmed by elemental analysis and digestive proton NMR. Finally, the ionic conductivity properties of the composite materials were probed by electrochemical impedance spectroscopy. The results showed that despite the 40% increased loading of NaIL in the NaIL@ZIF-8micro sample, the ionic conductivities at 25 °C were 8.4 × 10−6 and 1.6 × 10−5 S cm−1 for NaIL@ZIF-8meso and NaIL@ZIF-8micro respectively. These results exemplify the importance of the long range, continuous ion pathways contributed by the microcrystalline pores, as well as the limited contribution from the discontinuous mesopores to the overall ionic conductivity.
College: Faculty of Science and Engineering
Funders: T. D. B. thanks the Royal Society for both a University Research Fellowship (UF150021) and a research grant (RSG\R1\180395). T. D. B. also gratefully acknowledges the University of Canterbury Te Whare Wānanga o Waitaha, New Zealand, for a University of Cambridge Visiting Canterbury Fellowship, and the Leverhulme Trust for a Philip Leverhulme Prize. J. M. T, C. D. and J. K. M. acknowledge funding from NanoDTC EPSRC Grant EP/L015978/1. J. K. M. also acknowledges funding from the Cambridge Trust. S. E. D. acknowledges funding from the Winton Programme for the Physics of Sustainability. R. T. acknowledges the funding from China Scholarship Council. Q. S. acknowledges the funding from EPSRC Centre CAM-IES and ERC (NanoMMES, 851272). N. D. K. acknowledges PhD funding from the EPSRC Grant EP/R513180/1. J. M. T. would also like to thank Jack Hodkinson and Adam Lovett for their helpful discussions on the fitting of the electrochemical impedance spectra as well as Vahid Nozari and Lothar Wondraczek for further helpful discussions. J. K. M. would like to thank S. M. Collins for discussions on possible TEM approaches.
Issue: 44
Start Page: 15914
End Page: 15924

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