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Published on: December 20, 2016
Reversible electrodeposition and stripping of magnesium from solvate ionic liquid-tetrabutylammonium chloride
Pieter Geysens1, Jan Fransaer2, Koen Binnemans1
1Department of Chemistry, KU Leuven Celestijnenlaan 200F, P.O. Box 2404 B-3001 Leuven Belgium Koen.Binnemans@kuleuven.be.
Abstract:
The physicochemical properties of three new magnesium-containing solvate ionic liquids are reported. The solvation structures were analysed by Raman spectroscopy, revealing a solvent separated ion pair structure at room temperature. The reversible electrodeposition and stripping of magnesium from mixtures of these solvate ionic liquids and tetra-n-butylammonium chloride is described. The electrolytes are significantly less volatile than similar dilute electrolytes, even at elevated temperatures and the deposition current densities exceed 1 A dm-2 at 80 °C. The influence of the chloride concentration on magnesium deposition was studied with cyclic voltammetry and chronopotentiometry. It was found that the stripping of magnesium is governed by two competing reactions, and the addition of tetrabutylammonium chloride to the solvate ionic liquids was necessary to prevent passivation and efficiently strip the deposited magnesium.
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