Edge-Enriched, Porous Carbon-Based, High Energy Density Supercapacitors for Hybrid Electric Vehicles

Authors

  • Dr. Yong Jung Kim,

    1. Research Institute of Industrial Science and Technology, San32, Hyoja-dong, Nam-gu, Pohang, 790-60 (Korea)
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  • Dr. Cheol-Min Yang,

    1. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, 864-9 Dunsan-ri, Bongdong-eup, Wanju-gun, Jeollabuk-do, 565-902 (Korea)
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  • Prof. Ki Chul Park,

    1. Institute of Carbon Science & Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan)
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  • Prof. Katsumi Kaneko,

    1. Exotic Nanocarbon Research Center, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan)
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  • Prof. Yoong Ahm Kim,

    Corresponding author
    1. Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan), Fax: (+81) 26-269-5208
    • Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan), Fax: (+81) 26-269-5208
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  • Minoru Noguchi,

    1. Honda R&D Co., Automobile R&D Center, 4630 Shimotakanezawa, Haga-machi, Haga-gun, Tochigi 321-3393 (Japan)
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  • Takeshi Fujino,

    1. Honda R&D Co., Automobile R&D Center, 4630 Shimotakanezawa, Haga-machi, Haga-gun, Tochigi 321-3393 (Japan)
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  • Shigeki Oyama,

    1. Honda R&D Co., Automobile R&D Center, 4630 Shimotakanezawa, Haga-machi, Haga-gun, Tochigi 321-3393 (Japan)
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  • Prof. Morinobu Endo

    1. Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan), Fax: (+81) 26-269-5208
    2. Institute of Carbon Science & Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan)
    3. Exotic Nanocarbon Research Center, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553 (Japan)
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Abstract

Supercapacitors can store and deliver energy by a simple charge separation, and thus they could be an attractive option to meet transient high energy density in operating fuel cells and in electric and hybrid electric vehicles. To achieve such requirements, intensive studies have been carried out to improve the volumetric capacitance in supercapacitors using various types and forms of carbons including carbon nanotubes and graphenes. However, conventional porous carbons are not suitable for use as electrode material in supercapacitors for such high energy density applications. Here, we show that edge-enriched porous carbons are the best electrode material for high energy density supercapacitors to be used in vehicles as an auxiliary powertrain. Molten potassium hydroxide penetrates well-aligned graphene layers vertically and consequently generates both suitable pores that are easily accessible to the electrolyte and a large fraction of electrochemically active edge sites. We expect that our findings will motivate further research related to energy storage devices and also environmentally friendly electric vehicles.

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