Flower-like CoO@Cu2S nanocomposite for enhanced oxygen evolution reaction

Replacing precious metals with earth-abundant elements for electrochemical oxygen evolution reaction (OER) represents a judicious way to commercialization of large-scale water-splitting systems. However, the development of low-cost, efficient and durable OER catalysts remains a huge challenge. Herein, flower-like CoO@Cu2S nanocomposites were prepared with an etch-deposition approach by using cuprous oxide microcrystals as removable templates. Owing to the substantially enlarged surface area and interfacial charge transfer effects, the resulted product Cu2S@CoO was able to serve as highly efficient and durable OER electrocatalyst with a low overpotential (277 mV) at a current density of 10 mA?cm? 2 in alkaline electrolyte. This work enriches the ways to prepare complicate bimetallic nanocomposites for long-life and high-performance OER electrocatalysts.