An electrochemically deposited graphene@Mn3O4 composite film for supercapacitors

摘要

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.