One-pot hydrothermal synthesis of Mn3O4/graphene nanocomposite for supercapacitors

Mn3O4/graphene nanocomposite with the structure of Mn3O4 nanoparticles anchored on graphene sheets was synthesized using a facile in situ one-pot hydrothermal method. The growth of Mn3O4 nanoparticles and the reduction of graphene oxide occurred simultaneously during this hydrothermal process. Hexagonal flake-like Mn3O4 nanoparticles were found well-dispersed on graphene sheets. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements were used to assess the electrochemical properties of Mn3O4/graphene nanocomposite. The Mn3O4/graphene nanocomposite exhibited a specific capacitance of 171 F g−1 in 1 M Na2SO4 aqueous electrolyte and a good rate property. The results showed that the Mn3O4/graphene nanocomposite could be used as electrode material for high performance supercapacitors.

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► The Mn3O4/graphene nanocomposite was synthesized using a facile in situ one-pot hydrothermal method.
► The growth of Mn3O4 nanoparticles and the reduction of graphene oxide occurred simultaneously during the hydrothermal process.
► Hexagonal flake-like Mn3O4 nanoparticles were well-dispersed on graphene sheets.
► The nanocomposite exhibited a specific capacitance of 171 F g−1 in 1 M Na2SO4 aqueous electrolyte.