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)

• Record Type: Journal Article
• Authors: Gnana Sundara Raj, Balasubramaniam; Ko, Tae Hoon; Acharya, Jiwan; Seo, Min-Kang; Khil, Myung-Seob; Kim, Hak-Yong; Kim, Byoung-Suhk
• Is Part Of: Electrochimica acta. Volume 334(2020)
• Publication Date: 2020-02-20
• Subjects: Fe2O3/N-CNT composite -- Specific capacitance -- Rate capability -- Asymmetric device -- Energy density; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.135627
• Languages: English
• ISSNs: 0013-4686

Abstract

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.