Novel hydrothermally synthesized NiS nanomaterial decorated over g-CN nanosheet for OER activity

The main objective of the present work is the fabrication of extremely efficient and new electrocatalysts for the water splitting process, which is important for producing clean energy. Cost-effective metal sulfides have demonstrated greater advantages over other materials for OER in an alkaline electrolyte. Despite extensive efforts, we have synthesized the innovative g-CN/NiS nanocomposite using a hydrothermal technique for electrocatalytic water splitting. We conducted a comprehensive set of tests to analyze the electrocatalytic potential of synthesized electrocatalyst. Furthermore, the kinetic mechanisms of the produced electrocatalyst applied on nickel foam (NF) were investigated by linear sweep voltammetry (LSV). The chronoamperometry, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were employed to determine the stability and catalytic process using a basic (1.0 M KOH) solution. The electrochemical tests of g-CN/NiS nanocomposite exhibit an impressive overpotential 194 mV to achieve ideal current density (Cd) 10 mA cm−2 and have a lowest Tafel value (33 mV dec-1). In addition, compared to a reversible hydrogen electrode (RHE), the nanocomposite exhibits a decrease in onset potential by 1.42 V and has remarkable stability for a duration of 50 h. Hence, it is feasible to enhance electrochemical efficiency by altering the shape and surface interactions. These features collectively indicate that the electrocatalyst is highly suitable for the OER process.