Microstructure and electrochemical double-layer capacitance of carbon electrodes prepared by zinc chloride activation of sugar cane bagasse
Microstructure and electrochemical double-layer capacitance of carbon electrodes prepared by zinc chloride activation of sugar cane bagasse
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DOI：
10.1016/j.jpowsour.2009.08.048
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发表时间：
2010-02-01
影响因子：
9.2
通讯作者：
Lu, Gao Qing
中科院分区：
文献类型：
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作者：
Rufford, Thomas E.;Hulicova-Jurcakova, Denisa;Lu, Gao Qing
用于超级电容器电极的活性炭由甘蔗渣采用 ZnCl2 化学活化法制备而成。使用热重分析研究了甘蔗渣的 ZnCl2 活化，并使用 N-2 和 CO2 吸附表征了碳孔结构。在含有1 M H2SO4 的双电极夹层型超级电容器电池中，甘蔗渣碳（SCC）表现出高达10Wh kg(-1) 的比能量和接近300 Fg(-1) 的比电容。 SCC 的电化学性能归因于其高比表面积和 ZnCl2 浸渍比为 I 或更大的介孔的发展。相比之下，不使用 ZnCl2 的甘蔗渣热解会产生比电容较低的碳。 ZnCl2 比例为 3.5 制备的 SCC 在快速充放电速率下表现出最稳定的电化学性能。 (C) 2009 Elsevier B.V. 保留所有权利。
Activated carbons for supercapacitor electrodes are prepared from sugar cane bagasse using chemical activation with ZnCl2. The ZnCl2 activation of bagasse is studied using thermogravimetric analysis and the carbon pore structures are characterised using N-2 and CO2 adsorption. In two-electrode, sandwich-type supercapacitor cells containing 1 M H2SO4 the sugar cane bagasse carbons (SCCs) exhibit specific energy up to 10Wh kg(-1) and specific capacitance close to 300 Fg(-1). The electrochemical performance of the SCCs is attributed to their high specific surface area and the development of mesopores with ZnCl2 impregnation ratios of I or greater. By contrast, the pyrolysis of bagasse without ZnCl2 produces a carbon with low specific capacitance. The SCC prepared with a ZnCl2 ratio of 3.5 shows the most stable electrochemical performance at fast charge-discharge rates. (C) 2009 Elsevier B.V. All rights reserved.