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- Title
Towards ultrahigh volumetric capacitance: graphene derived highly dense but porous carbons for supercapacitors.
- Authors
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
- Abstract
Asmall 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 1.58 g cm23, 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 376 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
- Subjects
SUPERCAPACITOR performance; MICROMECHANICS; ELECTRIC capacity; THERMAL properties of graphite; ELECTROCHEMISTRY
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep02975