LAUSR

Facile synthesis of highly efficient and low‐cost electrocatalyst for oxygen evolution reaction (OER) is important for large‐scale hydrogen production. Herein, nickel hydroxide/reduced graphene oxide (Ni(OH)2/rGO) composite thin film was fabricated using dip‐coating followed by electrodeposition method on Ni foam substrate at room temperature. The deposited composite film shows amorphous nature with ultra‐thin Ni(OH)2 nanosheets vertically coated on rGO surface, which provides large electrochemical surface area and abundant catalytically active sites. It exhibits a low overpotential of 260 mV @10 mA cm−2 as compared to the pristine electrodes and excellent long‐term stability up to 20 hours in 1 M KOH solution. The electrochemical active surface area and Tafel slope of the composite electrode are 20.2 mF cm−2 and 35 mV dec−1, respectively. The superior water oxidation performance is a result of high catalytically active sites and improved conductivity of the composite electrode.