The electrochemical capacitance of nanoporous carbons in aqueous and ionic liquids
The electrochemical capacitance of nanoporous carbons in aqueous and ionic liquids
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DOI：
10.1016/j.jpowsour.2007.06.200
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发表时间：
2007-09-27
影响因子：
9.2
通讯作者：
Zhu, Guoyi
中科院分区：
文献类型：
--
作者：
Liu, Hongtao;Zhu, Guoyi
研究了活性炭、碳纳米管和碳凝胶等多孔炭材料的电化学电容。由于它们的多孔结构不同，这些碳在水溶液和离子液体中表现出不同的电容行为。结果表明，在两种介质中，碳纳米管和具有三维大孔骨架的碳凝胶在电荷容量上表现出相反的结果。实验结果表明，微孔材料在水溶液中表现出较高的电容，而大孔材料由于离子液体的可操作电压较高，更有利于提高离子液体的功率和能量性能。这可能意味着多孔材料的电容性能更多地取决于其与所施加的电解质的匹配程度，而不是其总孔体积。具有丰富大孔的碳材料更适合用于离子液体中，以充分发挥电容器的能量输出。基于离子液体中的3D大孔碳凝胶的电化学电容器已被证明显示出58 W h kg（-1）的比能量，与商业电池相当。(c)2007 Elsevier B. V.保留所有权利。
The electrochemical capacitance of porous carbon materials including activated carbon, carbon nanotubes, and carbon gels were investigated. Due to their different porous structures, these carbons showed different capacitive behaviors in aqueous solutions and ionic liquids. It was found that carbon nanotubes, having the largest micropore volume, and the carbon gels with 3D macroporous framework presented the opposite results in charge capacity in the two media. The experimental data showed that microporous materials presented the higher capacitance in aqueous solutions, while macropores were more favorable for improving power and energy properties in ionic liquids owing to the higher operable voltage of the ionic liquids. This may imply that the capacitive performance of a porous material depends more on its matching degree to the applied electrolytes than on its overall pore volume. Carbon materials with ample macropores could be more suitable to be used in ionic liquids to fully exert the energy output for a capacitor. An electrochemical capacitor based on 3D macroporous carbon gels in ionic liquids has been demonstrated to show a specific energy of 58 W h kg(-1), comparable to a commercial battery. (c) 2007 Elsevier B.V. All rights reserved.