An electrochemically deposited graphene@Mn3O4 composite film for supercapacitors

Abstract

A graphene@Mn₃O₄ composite film with a 3D nanoporous network structure has been successfully fabricated via electrochemical deposition. The electrochemical properties of the graphene@Mn₃O₄ composite as an electrode material for supercapacitors are investigated by cyclic voltammetry and galvanostatic charge–discharge tests. The specific capacity of the graphene@Mn₃O₄ composite is 357.2 F g⁻¹ at 5 mV s⁻¹ in a 1 M Na₂SO₄ aqueous electrolyte and the capacity retention is 99.4% after 1000 charge–discharge cycles.