title: Towards ultrahigh volumetric capacitance: graphene derived highly dense but porous carbons for supercapacitors.
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 1.58 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 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.
authors.affiliation: 1] School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China [2].
authors.forename: Ying
authors.initials: Y
authors.lastname: Tao
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Xie
authors.forename: Wei
authors.initials: W
authors.lastname: Lv
authors.forename: Dai-Ming
authors.initials: DM
authors.lastname: Tang
authors.forename: Debin
authors.initials: D
authors.lastname: Kong
authors.forename: Zhenghong
authors.initials: Z
authors.lastname: Huang
authors.forename: Hirotomo
authors.initials: H
authors.lastname: Nishihara
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ishii
authors.forename: Baohua
authors.initials: B
authors.lastname: Li
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Takashi
authors.initials: T
authors.lastname: Kyotani
authors.forename: Quan-Hong
authors.initials: QH
authors.lastname: Yang