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Synergistic Fusion of Vertical Graphene Nanosheets and Carbon Nanotubes for High-Performance Supercapacitor Electrodes

Authors

  • Dong Han Seo,

    1. CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)
    2. School of Physics, The University of Sydney, Sydney, NSW 2006 (Australia)
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    • These authors contributed equally to this work.

  • Samuel Yick,

    1. CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)
    2. School of Physics, The University of Sydney, Sydney, NSW 2006 (Australia)
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    • These authors contributed equally to this work.

  • Dr. Zhao Jun Han,

    Corresponding author
    1. CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)
    • CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)===

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  • Dr. Jing Hua Fang,

    1. CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)
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  • Prof. Kostya (Ken) Ostrikov

    Corresponding author
    1. CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)
    2. School of Physics, The University of Sydney, Sydney, NSW 2006 (Australia)
    3. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000 (Australia)
    • CSIRO Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070 (Australia)===

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Abstract

Graphene and carbon nanotubes (CNTs) are attractive electrode materials for supercapacitors. However, challenges such as the substrate-limited growth of CNTs, nanotube bundling in liquid electrolytes, under-utilized basal planes, and stacking of graphene sheets have so far impeded their widespread application. Here we present a hybrid structure formed by the direct growth of CNTs onto vertical graphene nanosheets (VGNS). VGNS are fabricated by a green plasma-assisted method to break down and reconstruct a natural precursor into an ordered graphitic structure. The synergistic combination of CNTs and VGNS overcomes the challenges intrinsic to both materials. The resulting VGNS/CNTs hybrids show a high specific capacitance with good cycling stability. The charge storage is based mainly on the non-Faradaic mechanism. In addition, a series of optimization experiments were conducted to reveal the critical factors that are required to achieve the demonstrated high supercapacitor performance.

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