Flexible rGO/MnO2(2.5)/CB hybrid
film was prepared by simple
vacuum
filtration method. MnO2 exists on both sides of the
graphene layers serving as active sites for the electrochemical
reactions which remarkably enhances the specific capacitance.
While CB acting as spacers between the graphene layers prevents
the restacking of graphene layers and improves the conductivity
between the graphene layers, leading to a better rate performance.
By the synergistic effects of CB and MnO2, the capacitance of the
ternary
film is improved to 209 F g1 at the scan rate of 5 mV s1
while maintains 77 F g1 even at the fast scan rate of 1 V s1. The
energy density of the ASC based on rGO/MnO2(2.5)/CB ternary
(positive electrode)
film and rGO/CB binary
film (negative
electrode) in Na2SO4 aqueous electrolyte can reach 24.3 Wh kg1.
Furthermore, the energy density remains 10 Wh kg1 at the high
power density of 45 kW kg1. The as-fabricated solid-state ASC on
Au coated PET exhibits a good energy density of 20 Wh kg1 as well
as a high rate behavior of 10 Wh kg1 at the power density of
21 kW kg1. This work shows a potential of rGO/MnO2(2.5)/CB