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Influence of water content and applied potential on the electrodeposition of Ni coatings from deep eutectic solvents

par Lukaczynska, Monika;Mernissi Cherigui, El Amine ;Ceglia, Andrea;Van Den Bergh, Krista;De Strycker, Joost;Terryn, Herman ;Ustarroz Troyano, Jon
Référence Electrochimica Acta, 319, page (690-704)
Publication Publié, 2019-10-01

Article révisé par les pairs

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Résumé :

Ni coatings were electrodeposited from 1:2 choline chloride (ChCl) - urea (U) deep eutectic solvents (DESs) on low carbon steel. We report on the inter-related influence of water content in the electrolyte and applied potential on the formation of Ni films and their chemical composition and morphology. This was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) in combination with ex-situ characterization techniques (FE-SEM, EDS, XPS and Raman spectroscopy). Ni electrodeposition from DES is shown to be highly complex: Ni+2 reduction is followed by water reduction, which triggers electrolyte decomposition. A water content higher than 4.5%wt and/or performing electrodeposition at potentials more negative than E