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Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co3O4 Hollow Nanoparticles as Self-Supported Electrodes for Electrochemical Capacitors

Authors

  • Fang Zhang,

    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Changzhou Yuan,

    1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459
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  • Jiajia Zhu,

    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Jie Wang,

    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Xiaogang Zhang,

    Corresponding author
    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
    • College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Xiong Wen (David) Lou

    Corresponding author
    1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459
    • School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459.
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Abstract

Flexible porous films are prepared from electrospun carbon nanofibers (CNFs) embedded with Co3O4 hollow nanoparticles (NPs) and are directly applied as self-supported electrodes for high-performance electrochemical capacitors. Uniform Co3O4 hollow NPs are well dispersed and/or embedded into each CNF with desirable electrical conductivity. These Co3O4-CNFs intercross each other and form 3D hierarchical porous hybrid films. Benefiting from intriguing structural features, the unique binder-free Co3O4 hollow NPs/CNF hybrid film electrodes exhibit high specific capacitance (SC), excellent rate capability and cycling stability. As an example, the flexible hybrid film with loading of 35.9 wt% Co3O4 delivers a SC of 556 F g−1 at a current density of 1 A g−1, and 403 F g−1 even at a very high current density of 12 A g−1. Remarkably, almost no decay in SC is found after continuous charge/discharge cycling for 2000 cycles at 4 A g−1. This exceptional electrochemical performance makes such novel self-supported Co3O4-CNFs hybrid films attractive for high-performance electrochemical capacitors.

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