Geysens Pieter, Fransaer Jan, Binnemans Koen
Department of Chemistry, KU Leuven Celestijnenlaan 200F, P.O. Box 2404 B-3001 Leuven Belgium
Department of Materials Engineering, KU Leuven Kasteelpark Arenberg 44 B-3001 Leuven Belgium.
RSC Adv. 2020 Nov 18;10(69):42021-42029. doi: 10.1039/d0ra08187f. eCollection 2020 Nov 17.
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--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 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.
报道了三种新型含镁溶剂化离子液体的物理化学性质。通过拉曼光谱分析溶剂化结构，发现在室温下为溶剂分隔离子对结构。描述了镁在这些溶剂化离子液体与四丁基氯化铵混合物中的可逆电沉积和剥离。即使在高温下，这些电解质的挥发性也明显低于类似的稀电解质，并且在80°C时沉积电流密度超过1 A dm。用循环伏安法和计时电位法研究了氯化物浓度对镁沉积的影响。发现镁的剥离受两个竞争反应控制，并向溶剂化离子液体中添加四丁基氯化铵对于防止钝化和有效剥离沉积的镁是必要的。
