Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

被引:91
|
作者
Barzegar, Farshad [1 ]
Bello, Abdulhakeem [1 ]
Momodu, Damilola [1 ]
Madito, Moshawe Jack [1 ]
Dangbegnon, Julien [1 ]
Manyala, Ncholu [1 ]
机构
[1] Univ Pretoria, Dept Phys, Inst Appl Mat, SARCHI Chair Carbon Technol & Mat, ZA-0028 Pretoria, South Africa
基金
新加坡国家研究基金会;
关键词
Expanded graphite; Supercapacitor; Energy storage; Activated carbon nanosheets; RAMAN-SPECTROSCOPIC CHARACTERIZATION; DOUBLE-LAYER CAPACITORS; MESOPOROUS CARBONS; ACTIVATED CARBONS; SURFACE-AREA; PERFORMANCE; GRAPHENE; SIZE; PORE; XPS;
D O I
10.1016/j.jpowsour.2016.01.097
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, we present the synthesis of low cost carbon nanosheets derived from expanded graphite dispersed in Polyvinylpyrrolidone, subsequently activated in KOH and finally carbonized in Ar/H-2 atmosphere. Interconnected sheet-like structure with low concentration of oxygen (9.0 at%) and a specific surface area of 457 m(2) g(-1) was obtained. The electrochemical characterization of the carbon material as supercapacitor electrode in a 2-electrode configuration shows high specific capacitance of 337 F g(-1) at a current density of 0.5 A g(-1) as well as high energy density of 37.9 Wh kg(-1) at a power density of 450 W kg(-1). This electrical double layer capacitor electrode also exhibits excellent stability after floating test for 120 h in 6 M KOH aqueous electrolyte. These results suggest that this activated expanded graphite (AEG) material has great potential for high performance electrode in energy storage applications. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:245 / 253
页数:9
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