Graphene-based electrochemical supercapacitors

被引：818

作者：

Vivekchand, S. R. C.

Rout, Chandra Sekhar

Subrahmanyam, K. S.

Govindaraj, A.

Rao, C. N. R. ^{[2
]}

机构：

[1] Jawaharlal Nehru Ctr Adv Sci Res, DST Unit Nanosci, Bangalore 560064, Karnataka, India

[2] CSIR, Chem & Phys Mat Unit, Ctr excellence Chem, Bangalore 560064, Karnataka, India

来源：

JOURNAL OF CHEMICAL SCIENCES | 2008年 / 120卷 / 01期

关键词：

graphenes; electrochemical supercapacitors; carbon nanotubes; electrode materials;

D O I：

10.1007/s12039-008-0002-7

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Graphenes prepared by three different methods have been investigated as electrode materials in electrochemical supercapacitors. The samples prepared by exfoliation of graphitic oxide and by the transformation of nanodiamond exhibit high specific capacitance in aq. H2SO4, the value reaching up to 117 F/g. By using an ionic liquid, the operating voltage has been extended to 3.5 V (instead of 1 V in the case of aq. H2SO4), the specific capacitance and energy density being 75 F/g and 31.9 Wh kg(-1) respectively. This value of the energy density is one of the highest values reported to date. The performance characteristics of the graphenes which are directly related to the quality, in terms of the number of layers and the surface area, are superior to that of single-walled and multi-walled carbon nanotubes.

引用

页码：9 / 13

页数：5

共 21 条

[1]

An KH, 2001, ADV MATER, V13, P497, DOI 10.1002/1521-4095(200104)13:7<497::AID-ADMA497>3.0.CO

[2]

2-H

[3]

ANDERSSON O, PHYS REV B, V58, P16387

[4] Cycling stability of a hybrid activated carbon//poly(3-methylthiophene) supercapacitor with N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid as electrolyte [J].