Microwave‐Assisted Synthesis of Nickel Sulfide/Iron Sulfide (NiS₂/Fe₇S₈) Rods for Oxygen Evolution Reaction

Generation of hydrogen fuel from renewable sources like water via electrolysis is an effective process to produce it. For this process an efficient, inexpensive, and durable electrocatalyst is required for splitting of water molecules. Herein, a rod‐shaped nickel sulfide/iron sulfide (NiS₂/Fe₇S₈) electrocatalyst is fabricated for the water splitting reaction by the microwave method. NiS₂/Fe₇S₈ exhibits a very low overpotential of 250 and 300 mV at current densities of 25 mA cm⁻² (η₂₅) and 40 mA cm⁻² (η₄₀), respectively, and a Tafel slope value of 26 mV dec⁻¹ for oxygen evolution reaction in a basic electrolyte. It shows electrochemical stability of 45 h with low impedance and high electrochemical surface area.