Nitric Acid Modification of Graphene Nanosheets Prepared by Arc-Discharge Method and Their Enhanced Electrochemical Properties

doi:10.3866/PKU.WHXB201204261

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	Nitric Acid Modification of Graphene Nanosheets Prepared by Arc-Discharge Method and Their Enhanced Electrochemical Properties
	Shen Bao-Shou 1,2; Feng Wang-Jun 2; Lang Jun-Wei 1; Wang Ru-Tao 1; Tai Zhi-Xin 1; Yan Xing-Bin 1
刊名	ACTA PHYSICO-CHIMICA SINICA
	2012-07
卷号	28 期号:7 页码:1726-1732
关键词	Graphene Arc-discharge Chemical modification Specific capacitance Supercapacitor
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB201204261
英文摘要	Large-scale synthesis of few-layer graphene nanosheets (GNSs) with high crystallinity and electrical conductivity (1680 S.m(-1)) is achieved by an arc-discharge method. The GNSs exhibited good morphologies as observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). However, electrochemical testing showed that the performance of the graphene (GNS) electrodes in supercapacitors was poor. To increase the surface active sites for electrochemical reactions and promote the wettability by aqueous electrolyte of the GNSs, a nitric acid treatment was used to chemically modify their surface. The acid treatment introduced more oxygen/nitrogen-containing functional groups onto the GNS surface, and clearly enhanced the hydrophilicity. The nitric-acid-modified GNSs (H-GNSs) showed vastly better electrode performance, with a maximum specific capacitance of 65.5 F.g(-1) (about 30 times that of original GNSs) at a current density of 0.5 A.g(-1) in 2 mol.L-1 KOH electrolyte. In addition, the H-GNS electrode showed good cycling stability and lifetime after running 2000 cycles. Therefore, H-GNSs may be an attractive candidate as electrode materials for supercapacitors.
资助项目	Youth Science Foundations of Gansu Province, China[1107RJYA274]
WOS研究方向	Chemistry
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000305923100025
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34888]
专题	理学院
通讯作者	Feng Wang-Jun
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Shen Bao-Shou,Feng Wang-Jun,Lang Jun-Wei,et al. Nitric Acid Modification of Graphene Nanosheets Prepared by Arc-Discharge Method and Their Enhanced Electrochemical Properties[J]. ACTA PHYSICO-CHIMICA SINICA,2012,28(7):1726-1732.
APA	Shen Bao-Shou,Feng Wang-Jun,Lang Jun-Wei,Wang Ru-Tao,Tai Zhi-Xin,&Yan Xing-Bin.(2012).Nitric Acid Modification of Graphene Nanosheets Prepared by Arc-Discharge Method and Their Enhanced Electrochemical Properties.ACTA PHYSICO-CHIMICA SINICA,28(7),1726-1732.
MLA	Shen Bao-Shou,et al."Nitric Acid Modification of Graphene Nanosheets Prepared by Arc-Discharge Method and Their Enhanced Electrochemical Properties".ACTA PHYSICO-CHIMICA SINICA 28.7(2012):1726-1732.