Mediated Electrosynthesis of Cobalt Nanoparticles from Ionic Liquids

摘要

The electrochemical behavior of cobalt in the presence of methylviologen (MV~(2+)) dichloride was investigated in choline chloride-urea (1:2 molar ratio) deep eutectic solvent containing 1 mM CoSO_4 and 1 mM MV~(2+). Cyclic voltammetry of cobalt electrolyte after reduction process at stationary potential has shown the shift of oxidation peak to cathodic region with increase of reduction process time. The investigations carried out after electrolysis of the system containing 1 mM CoSO_4 and 1 mM MV~(2+) at the reduction peak of methylviologen dichloride have shown that there was an accumulation of cobalt reduced form in near-electrode region whereas the concentration of methylviologen reduced form has not changed. This may indicate that methylviologen dichloride is a mediator in electrochemical processes with respect to cobalt in the system under consideration.