V. Jovanovski, B. Orel, I. Jerman
Aug 1, 2007
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Journal
Electrochemistry Communications
Abstract
Abstract An electrochemical and in-situ Raman spectroelectrochemical study of 1-methyl-3-propylimidazolium iodide ionic liquid electrolyte ( MPIm + I x - ) in the absence ( x = 1) and presence ( x = 3) of iodine is presented. Cyclic voltammetric measurements in combination with a platinum disk microelectrode revealed a remarkable difference before and after addition of iodine to the ionic liquid, implying the electrochemical formation of polyiodide ions ( I 5 - ) at potentials more positive than +0.6 V in the presence of an equimolar amount of iodine. To verify this presumption, we performed in-situ Raman spectroelectrochemical measurements of MPIm + I − and MPIm + I − + I 2 ionic liquids in a laboratory-made spectroelectrochemical cell, while stepwise changing the potential of the working platinum disk electrode. The results obtained were in good accordance with the above-mentioned postulate about the presence of polyiodide species ( I 5 - ) , and can be conveniently employed in further investigations to elucidate of the Grotthus mechanism, associated with increasing conductivity as a result of the formation of polyiodides.