Electrodeposition of copper in 1,3-dimethyl-2-imidazolidinone-AlCl3-Cu2O ionic liquid
In order to find a new method for electrodeposition of metallic copper,1,3-dimethyl-2-imidazolinone(DMI)-AlCl3-Cu2O solvated ionic liquid with molar ratio of 90:10:4 was chosen for the potentiostatic electrodeposition of copper in the paper,and the ionic structure,conductivity,viscosity and density of the electrolyte were analyzed.Raman spectroscopy and NMR analysis results show the presence of[AlCl2(DMI)4]+,AlCl3(DMI)2,and[AlCl4]-species in the DMI-AlCl3-Cu2O system.The conductivity,viscosity and density of the DMI-AlCl3-Cu2O system vary with temperature by a linear law at 323-373 K.The cyclic voltammetry study results show that-0.4 V is the starting reduction potential of copper,and the reduction peak appears at-1.35 V.Copper metal can be obtained by potentiostatic electrodeposition at potentials ranging from-1.1 V to-1.4 V,with diameters of about 20-40 μm.The coatings obtained at-1.1 V and-1.4 V have a flat surface,and copper particles with nano-needle-like structures can be obtained at-1.2 V and-1.3 V.
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