title: On the cobalt and cobalt oxide electrodeposition from a glyceline deep eutectic solvent.
abstract: The electrodeposition of cobalt and cobalt oxides from a glyceline deep eutectic solvent is reported. Cyclic voltammetry, chronoamperometry, scanning electron microscopy, and Raman spectroscopy are employed to study the Co deposition processes. Surface analysis reveals that metallic cobalt is deposited at potentials less negative than the current peak potential whereas cobalt oxides are detected and electrochemically observed when the deposition is done at more negative potentials. i-t transients are analyzed by applying the Scharifker and Hills (SH) theoretical model. It is concluded that cobalt deposition occurs via a progressive nucleation and growth mechanism for concentrations higher than 0.05 mol L-1cobalt ions. For concentrations ≤0.025 mol L-1cobalt ions and low overpotentials, the mechanism changes to instantaneous nucleation. The im-tmrelationships of the SH model are used to determine the values of the kinetic parameters and the cobalt ion diffusion coefficient.
authors.affiliation: Instituto de Química, Universidade Estadual Paulista, UNESP, 14800-900 Araraquara, SP, Brazil. benedeti@iq.unesp.br.
authors.forename: Alan M P
authors.identifier: http://orcid.org/0000-0001-6992-9334
authors.initials: AM
authors.lastname: Sakita
authors.affiliation: Centro de Química Estrutural-CQE, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: Rodrigo
authors.identifier: http://orcid.org/0000-0002-2316-2323
authors.initials: R
authors.lastname: Della Noce
authors.affiliation: Instituto de Química, Universidade Estadual Paulista, UNESP, 14800-900 Araraquara, SP, Brazil. benedeti@iq.unesp.br.
authors.forename: Cecílio S
authors.initials: CS
authors.lastname: Fugivara
authors.affiliation: Instituto de Química, Universidade Estadual Paulista, UNESP, 14800-900 Araraquara, SP, Brazil. benedeti@iq.unesp.br.
authors.forename: Assis V
authors.identifier: http://orcid.org/0000-0002-0243-6639
authors.initials: AV
authors.lastname: Benedetti