Abstract
The anodic discharge of chloride ion on platinum and graphite electrodes was investigated in a typical room temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF 6) in the presence of high concentrations of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl). The unusual observation is that during constant potential or current electrolysis, the oxidation of the chloride ion did not lead to chlorine gas evolution. Investigation by cyclic voltammetry and UV–Vis spectrometry revealed that the anodic products of the electrolysis, including Cl 2 and Cl 3 - , were retained in the ionic liquid.
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