ni-w alloy coating as an efficient electrocatalyst for the hydrogen evolution reaction: effect of electroplating current density on morphology and electrocatalytic properties

This research synthesized a nickel-tungsten coating as a catalyst for hydrogen evolution reaction (her) with different current densities and assessed the resulting electrocatalytic properties and morphology. linear sweep voltammetry (lsv), electrochemical impedance spectroscopy (eis), and chronoamperometry in 1 m naoh were used to evaluate the electrocatalytic activity for her. a columnar morphology was observed by increasing the current density of electrodeposition up to 500 ma/cm². the cyclic voltammetry test (cv) revealed that when the plating current density increases, cdl increases from 248 to 1310 µf/cm² and the active surface area increases 5 times. the results showed that by modifying the coating morphology, the current density of the hydrogen evolution increased up to two times.