Electrochemistry of Sulfur and Polysulfides in Ionic Liquids

N.S.A. Manan, Leigh Aldous, Y. Alias, P Murray, L.J. Yellowlees, M.C. Lagunas, Christopher Hardacre

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The electrochemistry of elemental sulfur (S-8) and the polysulfides Na2S4 and Na2S6 has been studied for the first time in nonchloroaluminate ionic liquids. The cyclic voltammetry of S-8 in the ionic liquids is different to the behavior reported in some organic solvents, with two reductions and one oxidation peak observed. Supported by in situ UV-vis spectro-electrochemical experiments, the main reduction products of S-8 in [C(4)mim][DCA] ([C(4)mim] = 1-butyl-3-methylimidazolium; DCA = dicyanamide) have been identified as s(6)(2-) and S-4(2-), and plausible pathways for the formation of these species are proposed. Dissociation and/or disproportionation of the polyanions S-6(2-) and S-4(2-) appears to be slow in the ionic liquid, with only small amounts of the blue radical species S3(center dot-) formed in the solutions at r.t., in contrast with that observed in most molecular solvents.
Original languageEnglish
Pages (from-to)13873-13879
Number of pages7
JournalJournal of Physical Chemistry B
Issue number47
Publication statusPublished - 01 Dec 2011

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

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    Manan, N. S. A., Aldous, L., Alias, Y., Murray, P., Yellowlees, L. J., Lagunas, M. C., & Hardacre, C. (2011). Electrochemistry of Sulfur and Polysulfides in Ionic Liquids. Journal of Physical Chemistry B, 115(47), 13873-13879. https://doi.org/10.1021/jp208159v