Published in

Elsevier, Journal of Electroanalytical Chemistry, (714-715), p. 63-69, 2014

DOI: 10.1016/j.jelechem.2013.12.013

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Ionic liquids for solid-state electrolytes and electrosynthesis

This paper is available in a repository.
This paper is available in a repository.

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Abstract

The aim of this work was to demonstrate that non-toxic fluids such as ionic liquids (ILs) might be “green” and suitable for several applications. We have explored their potential as solvent-free electrolytes dispersed in natural polymer matrix and as electrolytes for electrosynthesis. The ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate ([C2mim][C2SO4]) was dispersed in gelatin and agar, producing free-standing-electrolyte membranes thermally stable up to 200 °C and an ionic conductivity of 9.73×10-5 S.cm-1 at 30 °C and 2.37×10-3 S.cm–1 at 100 °C for Gelatin[C2mim][C2SO4] and 1.10×10-5 S.cm-1 at 30 °C and 7.24×10-4 S.cm-1 at 100 °C for Agar[C2mim][C2SO4] films. These samples were then tested in electrochromic devices (ECDs) revealing electrochemical reversibility during more than 200 color/bleaching cycles. Moreover, the electrochemical behavior of (1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane)nickel(II) bromide, [Ni(tmc)]Br2, at a glassy carbon electrode in the absence and in the presence of unsaturated halides in the ionic liquids, [C2mim][C2SO4] and N,N,N-trimethyl-N-(2-hydroxyethyl) ammonium bis(trifluoromethylsulfonyl)imide ([N1 1 1 2(OH)][NTf2]), has been examined by cyclic voltammetry. It was observed that [Ni(tmc)]2+ complex was reduced in a reversible one-electron step and the electrogenerated [Ni(tmc)]+ complex catalytically reduced the carbon-halogen bond of unsaturated halides. The obtained results showed that the investigated ionic liquids are good candidates for use as electrolytes in either solid or liquid form.