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A Study on the Effect of Current Density on Electrocatalytic Behavior of Ni–Co Alloy

Akshatha R. Shetty, Ampar Chitharanjan Hegde


Active, stable and more efficient electrocatalysts are the requirements for water splitting applications. In this direction, the present paper presents the experimental results on electrolytic development of Ni–Co alloy coatings, and their application as electrode material for hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). The Ni–Co alloy coatings were electrodeposited on copper substrate from a sulfate bath, using the glycerol as additive. The deposited coatings were then tested for electrocatalytic activities for HER and OER in 1M KOH medium, using cyclic voltammetry (CV) and chronopotentiometry (CP) methods. The experimental results revealed that Ni–Co alloy, deposited at high current densities (c.d.) are more favorable for OER and HER, and Tafel slope analysis showed the HER follows Volmer-Tafel mechanism. Better electrocatalytic activity of the coatings, deposited at high c.d. was attributed to the combined effect of increased surface roughness and its nickel content. The structure-property relationship of Ni–Co alloy coatings have been discussed through XRD, SEM and EDX results.

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