Schematic synthesis of cobalt-oxide (Co3O4) supported cobalt-sulfide (CoS) composite for oxygen evolution reaction

Development of electrocatalysts has received great attention for storage and energy conversion technologies. Different electrocatalysts for oxygen evolution reaction (OER) have been produced and investigated but their role is not sufficient to mark of Ruthenium oxide (RuO2). Therefore, it is global requirement to produce an efficient, lower cost and earth-abundant electrocatalyst for OER. Herein, cobalt oxide-cobalt sulfide (Co3O4-CoS2) composite have been synthesized via hydrothermal chemical method with active performance OER. The desired overpotential is 280 mV to achieve current density of 20 mA cm(-2) of as prepared composite with Tafel slope value of 74 mV dec(-1). As prepared Co3O4-CoS2 composite has efficient stability of 30 hours for long term electrochemical performance.