Funct. Mater. 2022; 29 (1): 93-99.

doi:https://doi.org/10.15407/fm29.01.93

Electrochemical treatment of nickel-copper alloy in ionic liquid based on eutectic mixture of choline chloride and ethylene glycol as a way to increase electrocatalytic activity towards hydrogen evolution reaction

V.S.Protsenko1, T.E.Butyrina1, D.O.Makhota1, S.A.Korniy2, F.I.Danilov1

1Ukrainian State University of Chemical Technology, 8 Gagarin Ave., 49005 Dnipro, Ukraine
2Karpenko Physico-Mechanical Institute, National Academy of Sciences of Ukraine, 5 Naukova Str., 79060 Lviv, Ukraine

Abstract: 

The effect of anodic treatment of a nickel-copper alloy (45 wt % Ni) in an ethanol solvent, which is a new type of room-temperature ionic liquids, on the morphological features of the surface and electrocatalytic properties is characterized. It is shown that the anodic etching of the alloy in ethaline has practically no effect on the chemical composition of the surface, but leads to the formation of a new type of surface morphology patterns: appearance of star-shaped and polyhedral asymmetric crystallites on a smoothed and defect-free surface. The anodic treatment of the nickel-copper alloy in ethaline at defined values of electrode potential allows significantly increasing the electrocatalytic activity towards the hydrogen evolution reaction in an aqueous alkaline medium, which can be used to create new highly efficient electrocatalytic materials for hydrogen energy.

Keywords: 
nickel-copper alloy, electrocatalytic materials, deep eutectic solvents, anode treatment, hydrogen energy.

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