CoSe2@Co3O4 nanostructures: A promising catalyst for oxygen evolution reaction in alkaline media

Synergistic integration based on some transition-metal (TM) derived compounds is a unique and appealing technique, especially toward oxygen evolution reaction (OER) under alkaline circumstances. Herein, we present a cobalt-selenide (CoSe2) and cobalt-oxide (Co3O4) based composite (CSCO-2) material through a wet chemical method. As-prepared catalyst has been analyzed for various physicochemical characterizations. CSCO-2 offers efficient OER performance in 1.0 M KOH with an overpotential of 252 mV at current density of 20 mA/cm2, with a low Tafel slope value of 69 mV/dec. Importantly, as-prepared catalyst shows stability of 48 h for longer electrochemical performance as a potential candidate for OER. [Display omitted] •Robust CoSe2 and Co3O4 based electrocatalyst for OER in the alkaline media.•Electrochemical efficiency with lower overpotential of 252 mV and Tafel slope of 69 mV/dec.•Having an electrochemical surface area of 367.5 cm2.•Stability for 48 h as longer performance.