Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent

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Título: Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent
Autor/es: Sebastián, Paula | Giannotti, Marina Inés | Gómez, Elvira | Feliu, Juan M.
Grupo/s de investigación o GITE: Electroquímica de Superficies
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Palabras clave: Deep eutectic solvent | Nickel electrodeposition | Glassy carbon | Platinum electrode | Pt(111) | SEM | AFM | Nanostructures | Surface sensitive
Área/s de conocimiento: Química Física
Fecha de publicación: 16-feb-2018
Editor: American Chemical Society
Cita bibliográfica: ACS Applied Energy Materials. 2018, 1(3): 1016-1028. doi:10.1021/acsaem.7b00177
Resumen: The first steps of nickel electrodeposition in a deep eutectic solvent (DES) are analyzed in detail. Several substrates from glassy carbon to Pt(111) were investigated pointing out the surface sensitivity of the nucleation and growth mechanism. For that, cyclic voltammetry and chronoamperometry, in combination with scanning electron microscopy (SEM), were employed. X-ray diffraction (XRD) and atomic force microscopy (AFM) were used to more deeply analyze the Ni deposition on Pt substrates. In a 0.1 M NiCl2 + DES solution (at 70 °C), the nickel deposition on glassy carbon takes place within the potential limits of the electrode in the blank solution. Although, the electrochemical window of Pt|DES is considerably shorter than on glassy carbon|DES, it was still sufficient for the nickel deposition. On the Pt electrode, the negative potential limit was enlarged while the nickel deposit grew, likely because of the lower catalytic activity of the nickel toward the reduction of the DES. At lower overpotentials, different hydrogenated Ni structures were favored, most likely because of the DES co-reduction on the Pt substrate. Nanometric metallic nickel grains of rounded shape were obtained on any substrate, as evidenced by the FE-SEM. Passivation phenomena, related to the formation of Ni oxide and Ni hydroxylated species, were observed at high applied overpotentials. At low deposited charge, on Pt(111) the AFM measurements showed the formation of rounded nanometric particles of Ni, which rearranged and formed small triangular arrays at sufficiently low applied overpotential. This particle pattern was induced by the ⟨111⟩ orientation and related to surface sensitivity of the nickel deposition in DES. The present work provides deep insights into the Ni electrodeposition mechanism in the selected deep eutectic solvent.
Patrocinador/es: This work has been financially supported by the MCINN-FEDER (Spain) through the projects CTQ2016-76221-P and TEC2014-51940-C2-2R. P.S. acknowledges MECD for the award of an FPU grant.
ISSN: 2574-0962
DOI: 10.1021/acsaem.7b00177
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2018 American Chemical Society
Revisión científica: si
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Aparece en las colecciones:INV - EQSUP - Artículos de Revistas

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