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A Novel High-Energy Hybrid Supercapacitor with an Anatase TiO2–Reduced Graphene Oxide Anode and an Activated Carbon Cathode

Authors

  • Haegyeom Kim,

    1. Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea
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  • Min-Young Cho,

    1. KICET, 233-5 Gasan-dong, Guemcheon-Gu, Seoul 153-801, Republic of Korea
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  • Mok-Hwa Kim,

    1. KICET, 233-5 Gasan-dong, Guemcheon-Gu, Seoul 153-801, Republic of Korea
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  • Kyu-Young Park,

    1. Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea
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  • Hyeokjo Gwon,

    1. Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea
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  • Yunsung Lee,

    1. Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea
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  • Kwang Chul Roh,

    1. KICET, 233-5 Gasan-dong, Guemcheon-Gu, Seoul 153-801, Republic of Korea
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  • Kisuk Kang

    Corresponding author
    1. Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea
    2. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul 151-742, Republic of Korea
    • Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea.

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Abstract

A hybrid supercapacitor with high energy and power densities is reported. It comprises a composite anode of anatase TiO2 and reduced graphene oxide and an activated carbon cathode in a non-aqueous electrolyte. While intercalation compounds can provide high energy typically at the expense of power, the anatase TiO2 nanoparticles are able to sustain both high energy and power in the hybrid supercapacitor. At a voltage range from 1.0 to 3.0 V, 42 W h kg−1 of energy is achieved at 800 W kg−1. Even at a 4-s charge/discharge rate, an energy density as high as 8.9 W h kg−1 can be retained. The high energy and power of this hybrid supercapacitor bridges the gap between conventional batteries with high energy and low power and supercapacitors with high power and low energy.

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