Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent
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http://hdl.handle.net/10045/74636
Title: | Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent |
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Authors: | Sebastián, Paula | Giannotti, Marina Inés | Gómez, Elvira | Feliu, Juan M. |
Research Group/s: | Electroquímica de Superficies |
Center, Department or Service: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Keywords: | Deep eutectic solvent | Nickel electrodeposition | Glassy carbon | Platinum electrode | Pt(111) | SEM | AFM | Nanostructures | Surface sensitive |
Knowledge Area: | Química Física |
Issue Date: | 16-Feb-2018 |
Publisher: | American Chemical Society |
Citation: | ACS Applied Energy Materials. 2018, 1(3): 1016-1028. doi:10.1021/acsaem.7b00177 |
Abstract: | 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. |
Sponsor: | 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. |
URI: | http://hdl.handle.net/10045/74636 |
ISSN: | 2574-0962 |
DOI: | 10.1021/acsaem.7b00177 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2018 American Chemical Society |
Peer Review: | si |
Publisher version: | https://doi.org/10.1021/acsaem.7b00177 |
Appears in Collections: | INV - EQSUP - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2018_Sebastian_etal_ACSApplEnergyMater_final.pdf | Versión final (acceso restringido) | 10,43 MB | Adobe PDF | Open Request a copy |
2018_Sebastian_etal_ACSApplEnergyMater_accepted.pdf | Accepted Manuscript (acceso abierto) | 9,98 MB | Adobe PDF | Open Preview |
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