Preparation of Supercapacitor Electrodes through Selection of Graphene Surface Functionalities

被引:303
作者
Lai, Linfei [1 ,2 ,3 ,4 ]
Yang, Huanping [1 ]
Wang, Liang [1 ]
Teh, Boon Kin [1 ]
Zhong, Jianqiang [5 ]
Chou, Harry [3 ,4 ]
Chen, Luwei [2 ]
Chen, Wei [5 ]
Shen, Zexiang [1 ]
Ruoff, Rodney S. [3 ,4 ]
Lin, Jianyi [2 ]
机构
[1] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
[2] ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore
[3] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
[4] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[5] Natl Univ Singapore, Fac Sci, Dept Phys, Singapore 117542, Singapore
关键词
supercapacitor electrodes; graphene; surface functionalities; DOUBLE-LAYER CAPACITANCE; CONDUCTING POLYMERS; CARBON MATERIALS; OXIDE; COMPOSITE; REDUCTION; CHEMISTRY; BEHAVIOR; SHEETS; ENERGY;
D O I
10.1021/nn3008096
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In order to investigate the effect of graphene surface chemistry on the electrochemical performance of graphene/polyaniline composites as supercapacitor electrodes, graphene oxide (G-O), chemically reduced G-O (RG-O), nitrogen-doped RG-O (N-RG-O), and amine-modified RG-O (NH2-RG-O) were selected as carriers and loaded with about 9 wt % of polyaniline (PANi). The surface chemistry of these materials was analyzed by FTIR, NEXAFS, and XPS, and the type of surface chemistry was found to be important for growth of PANi that influences the magnitude of increase of specific capacitance. The NH2-RG-O/PANi composite exhibited the largest increase in capacitance with a value as high as 500 F g(-1) and good cyclability with no loss of capacitance over 680 cycles, much better than that of RG-O/PANi, N-RG-O/PANi, and G-O/PANi when measured in a three-electrode system. A NH2-RG-O/PANWN-RG-O supercapacitor cell has a capacitance of 79 F g(-1), and the corresponding specific capacitance for NH2-RG-O/PANi is 395 F g(-1). This research highlights the importance of introducing -NH2 to RG-O to achieve highly stable cycling performance and high capacitance values.
引用
收藏
页码:5941 / 5951
页数:11
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