A novel Fe₂O₃-decorated N-doped CNT porous composites derived from tubular polypyrrole with excellent rate capability and cycle stability as advanced supercapacitor anode materials

As an advanced anode materials for high-performance asymmetric supercapacitors, the N-doped carbon nanotube (N-CNT) derived from tubular polypyrrole nanotube is decorated with Fe₂O₃ to produce the mesoporous 3D Fe₂O₃/N-CNT frameworks. The crystal structures and morphologies of the obtained products are investigated by XRD and FE-SEM. The electrochemical performances are evaluated by cyclic voltammetry, galvanostatic charge-discharge and impedance studies. The obtained Fe₂O₃/N-CNT composite electrode delivers a maximum specific capacitance of 264 F g⁻¹ at 1 mA cm⁻², high rate capability with a capacitance retention of 79% at 10 mA cm⁻² and good cycling stability with 84% capacitance loss after 10000 cycles at 7 mA cm⁻². The asymmetric Fe₂O₃/N-CNT//CuCo₂O₄ nanowires device exhibits at a high energy density 22.8 Wh kg⁻¹ at the power density 216 W kg⁻¹ in 2 M KOH aqueous electrolyte.