Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte
Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte
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DOI：
10.1016/j.jpowsour.2016.01.097
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发表时间：
2016-03-31
影响因子：
9.2
通讯作者：
Manyala, Ncholu
中科院分区：
文献类型：
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作者：
Barzegar, Farshad;Bello, Abdulhakeem;Manyala, Ncholu
在这项工作中，我们提出了低成本碳纳米片的合成方法，该纳米片源自分散在聚乙烯吡咯烷酮中的膨胀石墨，随后在 KOH 中活化，最后在 Ar/H-2 气氛中碳化。获得了低氧浓度(9.0at%)、比表面积为457m(2)g(-1)的互连片状结构。碳材料作为2电极配置的超级电容器电极的电化学特性显示出在0.5 A g(-1)电流密度下337 F g(-1)的高比电容以及在450 W kg(-1)功率密度下37.9 Wh kg(-1)的高能量密度。该双电层电容器电极在6 M KOH水性电解液中漂浮测试120小时后也表现出优异的稳定性。这些结果表明，这种活性膨胀石墨（AEG）材料在储能应用中作为高性能电极具有巨大的潜力。皇冠版权所有 (C) 2016 由 Elsevier B.V. 出版。保留所有权利。
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.