Abstract
The electrochemical behavior of Co(II) in urea-choline chloride-CoCl2 melt was investigated by cyclic voltammetry at 373K. The results show that the reaction of Co(II) to Co is irreversible and it proceeds via a one-step two electrons transfer process. The diffusion coefficient of Co(II) was estimated to be 1.7×10−6 cm2 s−1 at 373K. Electrodeposition of cobalt was studied at different cathodic potentials (-0.80 to -0.95V) and at different temperatures (353 to 383K) in eutectic mixture of choline chloride and urea (1:2 molar ratio). The deposits were characterized using scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). SEM images show that uniform, dense, and compact deposits were obtained at -0.80V within a temperature range of 353K to 373K. EDS and XRD analysis confirm that high-purity metallic Co deposits were obtained.
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