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. (20th February 2020) - Gnana Sundara Raj, Balasubramaniam
Abstract: 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 Fe2 O3 to produce the mesoporous 3D Fe2 O3 /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 Fe2 O3 /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 Fe2 O3 /N-CNT//CuCo2 O4 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. Graphical abstract: Image 1 Highlights: A novel Fe2 O3 -decorated N-doped CNT frameworks derived from tubular polypyrrole. Fe2 O3 /N-CNTs showed excellent rate capability of 79% and cycling stability of 84%. Asymmetric Fe2 O3 /N-CNT//CuCo2 O4 NWs device exhibited a high energy density.