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/cm(2) . The cyclic voltammetry test (CV) revealed that when the plating current density increases, Cdl increases from 248 to 1310 mu F/cm(2) 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.