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High theoretical capacitance of MnO 2  nanoparticles were successfully electrodeposited on the conductive graphene/activated carbon (GN/AC) composite film, and the urchin type MnO 2  microspheres were controlled by adjusting the electro-deposition reaction times. The GN/AC/MnO 2 -1200s composite electrodes exhibited a maximum specific capacitance of 1231 mF/cm 2  (MnO 2  loading mass of 7.65 mg/cm 2  and the mass specific capacitance of 123 F/g) at a current density of 0.5 mA/cm 2 . The assembled flexible solid-state symmetric supercapacitor had a good mechanical flexibility (about 88.6% of its original capacitance after 500 bending times) and prominent cycling stability (about 82.8% retention in capacitance over 10000 cycles). More importantly, the device could possess a maximum energy density of 0.27 mW h/cm 3  and a maximum power density of 0.02 W/cm 3 . These results well demonstrate a great potential for applications of GN/AC/MnO 2  composite electrodes in flexible energy storage devices.

High-performance MnO2-deposited graphene/activated carbon film electrodes for flexible solid-state supercapacitor