Reduced graphene oxide-mediated synthesis of Mn(3)O(4) nanomaterials for an asymmetric supercapacitor cell

Herein, Mn(3)O(4)/reduced graphene oxide composites are prepared via a facile solution-phase method for supercapacitor application. Transmission electron microscopy results reveal the uniform distribution of Mn(3)O(4) nanoparticles on graphene layers. The morphology of the Mn(3)O(4) nanomaterial is changed by introducing the reduced graphene oxide during the preparation process. An asymmetric supercapacitor cell based on the Mn(3)O(4)/reduced graphene oxide composite with the weight ratio of 1 : 1 exhibits relatively superior charge storage properties with higher specific capacitance and larger energy density compared with those of pure reduced graphene oxide or Mn(3)O(4). More importantly, the long-term stability of the composite with more than 90.3% capacitance retention after 10 000 cycles can ensure that the product is widely applied in energy storage devices.