Iron Nickel Sulfide Nanorods for Oxygen and Hydrogen Evolution Reaction

Abstract The electrochemical water splitting process needs fabrication of cost‐effective transition metal‐based materials for its commercialization process. Transition metal chalcogenides are good electrocatalysts for such processes in different media. Herein, we have synthesized Iron Nickel Sulfide (FeNiS 2 ) nanorods by one step hydrothermal method. The synthesized material performed excellent bifunctional activity i. e. Hydrogen Evolution Reaction (HER) & Oxygen Evolution Reaction (OER) in basic environment. The nanorod shaped FeNiS 2 deliver its OER activity at an overpotential of 250 mV to afford current density 10 mA cm −2 . It shows low Tafel slope of 99 mV/dec along with 11 h stability. Further, we have tested HER activity and the as‐prepared material shows a good overpotential of 141 mV at 10 mA cm −2 and low Tafel slope of 104 mV/dec with durability of 9 h. The electrochemical characterization suggests that FeNiS 2 nanorod could be an efficient, OER and HER electrocatalyst for water splitting reaction.