Facile synthesis of nanoflower shaped MnFe2O4@rGO nanocomposite for ultra-stable asymmetric supercapacitor

[Display omitted] •In this study, one-dimensional (1D) MnFe2O4@rGO nanowires were manufactured using a hydrothermal method.•The MnFe2O4@rGO electrode displays a high specific capacitance of 980 Fg−1 at 0.1 Ag−1, which is maintained at 330 Fg−1 at 10 Ag−1.•The MnFe2O4@rGO electrode has a capacitance retention of up to 93.9% after 10,000 cycles, which suggests that it has outstanding long-term cycling stability.•The energy density of this MnFe2O4@C//AC device is 20.5 Wh kg−1 at a power density of 325 W kg−1, and it continues to have an energy density of 10 Wh kg−1 at a high-power density of 9300 W kg−1. The innovative 1D and core–shell architecture, as well as the carbon coating, contribute to the material's enhanced electric conductivity and porous quality. Because of these benefits, the MnFe2O4@rGO electrode displays a high specific capacitance of 980 Fg−1 at 0.1 Ag−1. The MnFe2O4@rGO electrode has a capacitance retention of up to 93.9 % after 10,000 cycles, which suggests that it has outstanding long-term cycling stability. After being assembled with activated carbon (AC) to produce a MnFe2O4@C//AC device, the energy density of this MnFe2O4@C//AC device is 20.5 Wh kg−1 at a power density of 325 W kg−1.