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Compact and Light Supercapacitor Electrodes from a Surface-Only Solid by Opened Carbon Nanotubes with 2 200 m2 g−1 Surface Area

Authors

  • Tatsuki Hiraoka,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Ali Izadi-Najafabadi,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
    2. Meijo University Nagoya, 468-8502 (Japan)
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  • Takeo Yamada,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Don N. Futaba,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Satoshi Yasuda,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Osamu Tanaike,

    1. Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology AIST Tsukuba West, Tsukuba, 305-8569 (Japan)
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  • Hiroaki Hatori,

    1. Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology AIST Tsukuba West, Tsukuba, 305-8569 (Japan)
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  • Motoo Yumura,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Sumio Iijima,

    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
    2. Meijo University Nagoya, 468-8502 (Japan)
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  • Kenji Hata

    Corresponding author
    1. Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
    2. Japan Science and Technology Agency (JST) Kawaguchi, 332-0012 (Japan)
    • Nanotube Research Center National Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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Abstract

An approach is presented to make a “surface-only solid” with a surface area of 2 240 m2 g−1 (1 310 m2 cm−3), corresponding to 85% of the atoms constituting a surface, by opening single-walled carbon nanotube forests and solids via controlled oxidation. The controllability of the approach is demonstrated by tailoring the hole size to match the guest molecule, for example, nitrogen, fullerene, or solvated ions. These features make the surface-only solid an ideal vessel for material and energy storage, as demonstrated by its use for electrodes to realize a light and compact supercapacitor with high energy (24.7 W h kg−1) and power (98.9 kW kg−1) densities, exceeding those of activated carbon (16.9 W h kg−1 and 35.7 kW kg−1).

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