Graphene-Based Supercapacitor with an Ultrahigh Energy Density

被引:2751
作者
Liu, Chenguang [1 ,3 ]
Yu, Zhenning [2 ]
Neff, David [1 ]
Zhamu, Aruna [2 ]
Jang, Bor Z. [1 ]
机构
[1] Nanotek Instruments Inc, Dayton, OH 45404 USA
[2] Angstron Mat Inc, Dayton, OH 45404 USA
[3] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
关键词
Graphene; supercapacitor; energy density; ionic liquid; DOUBLE-LAYER CAPACITORS; GRAPHITE OXIDE; COMPOSITES; FILMS; ULTRACAPACITORS; EXFOLIATION; ELECTRODES; REDUCTION;
D O I
10.1021/nl102661q
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A supercapacitor with graphene based electrodes was found to exhibit a specific energy density of 85 6 Wh/kg at room temperature and 136 Wh/kg at 80 degrees C (all based on the total electrode weight) measured at a current density of 1 A/g These energy density values are comparable to that of the Ni metal hydride battery, but the supercapacitor can be charged or discharged in seconds or minutes The key to success was the ability to make full utilization of the highest intrinsic surface capacitance and specific surface area of single layer graphene by preparing curved graphene sheets that will not restack face to-face The curved morphology enables the formation of mesopores accessible to and wettable by environmentally benign ionic liquids capable of operating at a voltage >4 V
引用
收藏
页码:4863 / 4868
页数:6
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