Graphene nanosheets, polyaniline (PANI), and
nanocrystallites of transition metal ferrite {Fe3O4 (Mag),
NiFe2O4 (NiF), and CoFe2O4 (CoF)} have been prepared and
characterized via XRD, FTIR, SEM, TEM, UV–vis spectroscopy, cyclic voltammetry, galvanostatic charge discharges, and impedance spectroscopy. Electrochemical measurements showed
that supercapacitances of hybrid electrodes made of the ternary
materials are higher than that of hybrid electrode made of binary
or single material. The ternary hybrid CoF/graphene (G)/PANI
electrode exhibits a highest specific capacitance reaching
1123 Fg−1, an energy density of 240 Wh kg−1 at 1 A g−1, and
a power density of 2680 Wkg−1 at 1 A g−1 and outstanding
cycling performance, with 98.2% capacitance retained over
2000 cycles. The extraordinary electrochemical performance of
the ternary CoF/G/PANI hybrid can be attributed to the synergistic effects of the individual components. The PANI conducting
polymer enhances an electron transport. The Ferrite nanoparticles
prevent the restocking of the carbon sheets and provide Faradaic
processes to increase the total capacitance |
