Fabrication of S-g-C₃N₄/Ni-CuS nanocomposites: assessing the influence of S-g-C₃N₄ concentration on electrocatalytic performance for HER/OER activities

The shortage of fossil fuels and global warming are the two main issues facing the world today and these can be overcome by the usage of H₂ as a sustainable energy. The study’s primary objective is to fabricate an efficient electrocatalyst for electrochemical water splitting. This study uses CuS, Ni-doped CuS and Ni/CuS/S-g-C₃N₄ (NCS/SCN) composites for the electrochemical water-splitting. NCS/SCN composites were produced via the co-precipitation method with different S-g-C₃N₄ contents (10, 30, 50, 70, and 90 wt.%) to study the impact of S-g-C₃N₄ on the electrochemical water splitting performance of NCS. Characterization techniques SEM, EDX, FTIR, and XRD evaluated the electrocatalysts' size, shape, and morphology. Electrochemical studies were performed employing a three-electrode system using KOH as the electrolyte. Results from LSV, CV, and EIS show that the development of composite material NCS/SCN enhances the electrocatalytic water-splitting activity of NCS in 1 M KOH solution. Results show that NCS/50%SCN exhibits the best OER and HER and thus can be utilized as a commercial electrocatalyzer for water splitting.