Activated carbon made from cow dung as electrode material for electrochemical double layer capacitor
Activated carbon made from cow dung as electrode material for electrochemical double layer capacitor
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DOI：
10.1016/j.jpowsour.2014.03.143
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发表时间：
2014-09-15
影响因子：
9.2
通讯作者：
Yu, Jong-Sung
中科院分区：
文献类型：
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作者：
Bhattacharjya, Dhrubajyoti;Yu, Jong-Sung
牛粪是地球上产生的最丰富的废物之一，在大多数发展中国家传统上被用作肥料和燃料。以牛粪为原料，用KOH按不同比例对牛粪进行处理，采用改进的化学活化法制备活性炭。合成的活性炭具有不规则的表面形貌，比表面积在1500-2000 m2·g ~（-1）之间，并具有适量的介孔和中孔体积。特别是，我们表明，表面形态和孔隙率参数的变化与KOH比例的增加。将这些活性炭作为非水电解质中的双电极对称超级电容器系统中的电极材料进行测试，发现其表现出高比电容，在高电流密度和长期操作下具有优异的比电容保持率。特别地，在KOH与预炭化炭的2：1比例下合成的活性炭显示出最佳性能，在0.1Ag（-1）下具有124 Fg（-1）的比电容，并且在1.0Ag电流密度下保持高达117 Fg（-1）。性能归因于高表面积沿着与最佳量的微孔和中孔体积。(C)2014爱思唯尔有限公司版权所有。
Cow dung is one of the most abundant wastes generated on earth and has been traditionally used as fertilizer and fuel in most of the developing countries. In this study activated carbon is synthesized from cow dung by a modified chemical activation method, where partially carbonized cow dung is treated with KOH in different ratio. The synthesized activated carbon possesses irregular surface morphology with high surface area in the range of 1500-2000 m(2) g(-1) with proper amount of micropore and mesopore volume. In particular, we demonstrate that the surface morphology and porosity parameters change with increase in KOH ratio. These activated carbons are tested as electrode material in two-electrode symmetric supercapacitor system in non-aqueous electrolyte and found to exhibit high specific capacitance with excellent retention of it at high current density and for long term operation. In particular, the activated carbon synthesized at 2:1 ratio of KOH and the pre-carbonized char shows the best performance with specific capacitance of 124 F g(-1) at 0.1 A g(-1) and retains up to 117 F g(-1) at 1.0 A g current density. The performance is attributed to high surface area along with optimum amount of micropore and mesopore volume. (C) 2014 Elsevier B.V. All rights reserved.