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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (07): 1726-1732    DOI: 10.3866/PKU.WHXB201204261
ELECTROCHEMISTRY AND NEW ENERGY     
Nitric Acid Modification of Graphene Nanosheets Prepared by Arc- Discharge Method and Their Enhanced Electrochemical Properties
SHEN Bao-Shou1,2, FENG Wang-Jun1, LANG Jun-Wei2, WANG Ru-Tao2, TAI Zhi-Xin2, YAN Xing-Bin2
1School of Science, Lanzhou University of Technology, Lanzhou 730050, P. R. China; 2State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
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Abstract  

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.



Key wordsGraphene      Arc-discharge      Chemical modification      Specific capacitance      Supercapacitor     
Received: 23 February 2012      Published: 26 April 2012
MSC2000:  O646  
Fund:  

The project was supported by the Top Hundred Talents Program of the Chinese Academy of Sciences, Postdoctoral Science Foundation of China (20100480728), and Youth Science Foundations of Gansu Province, China (1107RJYA274).

Corresponding Authors: FENG Wang-Jun, YAN Xing-Bin     E-mail: wjfeng@lut.cn; xbyan@licp.cas.cn
Cite this article:

SHEN Bao-Shou, FENG Wang-Jun, LANG Jun-Wei, WANG Ru-Tao, TAI Zhi-Xin, YAN Xing-Bin. Nitric Acid Modification of Graphene Nanosheets Prepared by Arc- Discharge Method and Their Enhanced Electrochemical Properties. Acta Phys. Chim. Sin., 2012, 28(07): 1726-1732.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201204261     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I07/1726

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