Towards ultrahigh volumetric capacitance: Graphene derived highly dense but porous carbons for supercapacitors

Ying Tao, Xiaoying Xie, Wei Lv, Dai Ming Tang, Debin Kong, Zhenghong Huang, Hirotomo Nishihara, Takafumi Ishii, Baohua Li, Dmitri Golberg, Feiyu Kang, Takashi Kyotani, Quan Hong Yang

    Research output: Contribution to journalArticlepeer-review

    463 Citations (Scopus)

    Abstract

    A small volumetric capacitance resulting from a low packing density is one of the major limitations for novel nanocarbons finding real applications in commercial electrochemical energy storage devices. Here we report a carbon with a density of 1.58â.g cm-3, 70% of the density of graphite, constructed of compactly interlinked graphene nanosheets, which is produced by an evaporation-induced drying of a graphene hydrogel. Such a carbon balances two seemingly incompatible characteristics: a porous microstructure and a high density, and therefore has a volumetric capacitance for electrochemical capacitors (ECs) up to 376â.F cm-3, which is the highest value so far reported for carbon materials in an aqueous electrolyte. More promising, the carbon is conductive and moldable, and thus could be used directly as a well-shaped electrode sheet for the assembly of a supercapacitor device free of any additives, resulting in device-level high energy density ECs.

    Original languageEnglish
    Article number2975
    JournalScientific reports
    Volume3
    DOIs
    Publication statusPublished - 2013 Oct 17

    ASJC Scopus subject areas

    • General

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