Electrochemistry of Sulfur and Polysulfides in Ionic Liquids

详细信息    查看全文

• 作者：Ninie S. A. Manan ; Leigh Aldous ; Yatimah Alias ; Paul Murray ; Lesley J. Yellowlees ; M. Cristina Lagunas ; Christopher Hardacre
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：December 1, 2011
• 年：2011
• 卷：115
• 期：47
• 页码：13873-13879
• 全文大小：849K
• 年卷期：v.115,no.47(December 1, 2011)
• ISSN：1520-5207

文摘

The electrochemistry of elemental sulfur (S₈) and the polysulfides Na₂S₄ and Na₂S₆ has been studied for the first time in nonchloroaluminate ionic liquids. The cyclic voltammetry of S₈ 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鈥搗is spectro-electrochemical experiments, the main reduction products of S₈ in [C₄mim][DCA] ([C₄mim] = 1-butyl-3-methylimidazolium; DCA = dicyanamide) have been identified as S₆^{2鈥?/sup> and S₄2鈥?/sup>, and plausible pathways for the formation of these species are proposed. Dissociation and/or disproportionation of the polyanions S₆2鈥?/sup> and S₄2鈥?/sup> appears to be slow in the ionic liquid, with only small amounts of the blue radical species S₃鈥⑩€?/sup> formed in the solutions at r.t., in contrast with that observed in most molecular solvents.}