Facile synthesis of mesoporous cobalt oxide rugby balls for electrochemical energy storage

Abstract

Mesoporous Co₃O₄ rugby balls were firstly obtained by utilizing a facile two-step method. This unique morphology together with the mesoporous feature manifests excellent capacitive performance an energy density (14.3 W h kg⁻¹), a power density (7503 W kg⁻¹) and no decay after 10 000 cycles for constructing the Co₃O₄ rugby balls//graphene hydrogels asymmetric supercapacitor.