Ion diffusion in molten salt mixtures

Every, H., Bishop, A. G., Forsyth, M. and MacFarlane, D. R. 2000, Ion diffusion in molten salt mixtures, Electrochimica acta, vol. 45, no. 8-9, pp. 1279-1284, doi: 10.1016/S0013-4686(99)00332-1.

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Title Ion diffusion in molten salt mixtures
Author(s) Every, H.
Bishop, A. G.
Forsyth, M.ORCID iD for Forsyth, M.
MacFarlane, D. R.
Journal name Electrochimica acta
Volume number 45
Issue number 8-9
Start page 1279
End page 1284
Publisher Elsevier Science Pub. Co.
Place of publication New York, N.Y.
Publication date 2000-01-03
ISSN 0013-4686
Keyword(s) dialkylimidazolium molten salts
ionic conductivity
binary systems
transport mechanisms
Summary The molten salts, 1-methyl,3-ethylimidazolium trifluoromethanesulfonate (triflate salt, MeEtImTf) and 1-methyl,3-ethylimidazolium bis(trifluoromethanesulfonimide) (imide salt, MeEtImNTf2) are colourless ionic liquids with conductivities of the order of 10−2 S cm−1 at room temperature. DSC measurements revealed subambient melting and glass transition temperatures. Analysis of the anion and cation diffusion coefficients suggested that the cation was the dominant charge carrier and that the motion was largely independent of the anion. Haven ratios (HRs) of 1 and 1.6 were determined for the imide and triflate salts, respectively, at 30°C (303 K). Values greater than one imply some degree of ionic association, suggesting that aggregation is present in the triflate salt. Mixing of the salts to form binary systems resulted in enhanced conductivities which deviated from a simple law of mixtures. Thermal analysis showed no evidence of a melting point with only a glass transition observed. Corresponding diffusion measurements for the binaries appeared to show a weighted average of the diffusion coefficients of the pure components. The increased conductivity can be attributed to an increase in the number of charge carriers as a result of decreased ion association in the binary.
Language eng
DOI 10.1016/S0013-4686(99)00332-1
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2000, Elsevier Science Ltd.
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