Highly dispersed polypyrrole particles were decorated on reduced graphene oxide sheets using a facile in situ synthesis route. The prepared composite, which obtained a folded surface, shows remarkable performance as the electrode material of supercapacitors. The specific capacitance reaches 564.1 F g?1 at a current density of 1 A g?1 and maintains 86.4 % after 1000 charging–discharging cycles at a current density of 20 A g?1, which indicates a good cycling stability. Furthermore, the prepared supercapacitor demonstrates an ultrahigh energy density of 50.13 Wh kg?1 at power density of 0.40 kW kg?1, and remains of 45.33 Wh kg?1 even at high power density of 8.00 kW kg?1, which demonstrate that the hybrid supercapacitor can be a promising energy storage system for fast and efficient energy storage in the future.
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