超级电容器
石墨烯
电容
材料科学
碳纤维
石墨
电解质
纳米技术
电极
多孔性
电化学
储能
电容器
蒸发
化学工程
电解电容器
复合材料
化学
电压
复合数
电气工程
功率(物理)
物理
工程类
物理化学
量子力学
热力学
作者
Ying Tao,Xinglong Xie,Wei Lv,Dai‐Ming Tang,Debin Kong,Zheng‐Hong Huang,Hirotomo Nishihara,Takafumi Ishii,Baohua Li,Dmitri Golberg,Feiyu Kang,Takashi Kyotani,Quankui Yang
摘要
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.
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