The global demand for materials that are possessing high yields in the energy conversion, storage and use, has led to new research. These materials with a high surface-volume ratio allow an increase in the contact area between the electrode and electrolyte. Nanometric materials, such as nanoparticles, nanowires, nanorods, and nanosheets, generally have a greater reversible capacity and long-term useful life. Developing alternative materials, where their structure, porosity and morphology are mainly adapted. The Co (II) evaluation process was carried out onto three different substrates: glassy carbon, Au/Ti/Si and platinum. The Co deposits were obtained from a Deep Eutectic Solvent (1ChCl: 2Urea), and characterized by Scanning Electron Microscopy (SEM). The SEM images show that the Co morphology at glassy carbon is similar to the desert roses (Figure 1), and a reticular structure for metallic substrates. X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS) confirm that the deposits obtained correspond to the metallic cobalt. The potentiostatic experiments at low overpotentials show 3D nucleation and growth process on the glassy carbon substrate [1].

[1] L. Manh y M. Palomar Pardave, On Wetting Angles and Nucleation Energies during the Electrochemical Nucleation of Cobalt onto GC from a DES, Journal of The Electrochemical Society, 164, 12, pp. D694-D699, 2017.