Synthesis of reduced graphene oxide/Mn_3O_4 nanocomposites for supercapacitors

Reduced graphene oxide/Mn3O4(rGO/Mn3O4) nanocomposites were prepared from MnSO4and GO produced by a modified Hummers method. The GO was deoxygenated by heat treatment,and MnO2generated by hydrolysis of MnSO4was simultaneously reduced to Mn3O4. The Mn3O4content in the composites could be tailored by the volume of supernatant in the pristine GO/MnSO4suspension. The maximum specific capacitance of the rGO/Mn3O4composite is 284 F·g- 1at 50 mA·g- 1as an anode material in a saturated K2SO4solution. This approach separates GO from the suspension without complicated procedures,and cheap MnSO4is used as a Mn3O4source.