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Fabrication of Graphene Sheets Intercalated with Manganese Oxide/Carbon Nanofibers: Toward High-Capacity Energy Storage

Authors

  • Oh Seok Kwon,

    1. World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151–742, South Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Taejoon Kim,

    1. Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Jun Seop Lee,

    1. World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151–742, South Korea
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  • Seon Joo Park,

    1. World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151–742, South Korea
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  • Hyun-Woo Park,

    1. Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
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  • Minjeong Kang,

    1. Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
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  • Ji Eun Lee,

    1. Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
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  • Jyongsik Jang,

    Corresponding author
    1. World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151–742, South Korea
    • World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151–742, South Korea.
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  • Hyeonseok Yoon

    Corresponding author
    1. Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
    • Alan G. MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500–757, South Korea
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Abstract

Herein, 3D nanohybrid architectures consisting of MnOx nanocrystals, carbon nanofibers (CNFs), and graphene sheets are fabricated. MnOx-decorated CNFs (MCNFs) with diameters of about 50 nm are readily obtained via single-nozzle co-electrospinning, followed by heat treatment. The MCNFs are then intercalated between graphene sheets, yielding the ternary nanohybrid MCNF/reduced graphene oxide (RGO). This straightforward synthesis process readily affords product on a scale of tens of grams. The ultrathin CNFs, which might be a promising alternative to carbon nanotubes (CNTs), overcome the low electrical conductivity of the excellent pseudocapacitive component, MnOx. Furthermore, the graphene sheets separated by the MCNFs boost the electrochemical performance of the nanohybrid electrodes. These nanohybrid electrodes exhibit enhanced specific capacitances compared with a sheet electrode fabricated of MCNF-only or RGO-only. Evidently, the RGO sheet acts as a conductive channel inside the nanohybrid, while the intercalated MCNFs increase the efficiency of the ion and charge transfer in the nanohybrid. The proposed nanohybrid architectures are expected to lay the foundation for the design and fabrication of high-performance electrodes.

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