Electrical double-layer capacitance of micro- and mesoporous activated carbon prepared from rice husk and beet sugar
Electrical double-layer capacitance of micro- and mesoporous activated carbon prepared from rice husk and beet sugar
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DOI：
10.1016/j.electacta.2013.10.060
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发表时间：
2013-12-30
影响因子：
6.6
通讯作者：
Tashima, Daisuke
中科院分区：
文献类型：
--
作者：
Kumagai, Seiji;Sato, Masashi;Tashima, Daisuke
为了生产微米和中孔RH衍生的活性炭（AC），稻壳（RH）和甜菜糖（BS）的混合物被粉碎以产生前体，其经受二氧化硅浸出过程，然后CO2活化。固有地存在于天然RH中的二氧化硅用作中孔的模板，并且BS用于微孔的额外开发。制备了RH衍生的活性炭，并将其作为双电层电容器的电极材料。RH衍生的AC表现出BET比表面积为1357 m2/g，总孔体积为0.99 mL/g，中孔体积分数为44.4%，在两种水溶液中均显示出优异的上级电容性能。（1 M H2SO 4）和有机（1 M特马中心点BF 4/PC）电解质，与具有相似BET比表面积（1200-1600 m2/g）的商业微孔和介孔AC相比。通过使用三电极电池系统的循环伏安法以5 mV/s的扫描速率评估的比电容对于水性电解质为106 F/g，并且对于有机电解质为114 F/g。在有机电解质中，RH衍生的AC获得了更高的比电容，并且远高于商业AC的比电容。与水溶液和有机电解质的良好相容性归因于良好平衡的微孔和中孔。文中还讨论了微孔和介孔对两种电解质中活性炭电容性能的影响。(C)2013爱思唯尔有限公司保留所有权利。
To produce micro- and mesoporous RH-derived activated carbons (ACs), a mixture of rice husk (RH) and beet sugar (BS) was carbonized to produce a precursor, which was subjected to the silica-leaching process and then CO2 activation. The silica, intrinsically present in natural RH, was used as a template for mesopores, and BS was used for additional development of micropores. The RH-derived ACs were prepared with the intention of application as the electrode materials of electrical double-layer capacitors. The RH-derived AC, exhibiting BET specific surface area of 1357 m(2)/g, total pore volume of 0.99 mL/g, and mesopore volume fraction of 44.4%, showed superior capacitive performance in both aqueous (1 M H2SO4) and organic (1 M TEMA center dot BF4/PC) electrolytes, in comparison with commercial microporous and mesoporous ACs with similar BET specific surface area (1200-1600 m(2)/g). The specific capacitance, evaluated by means of cyclic voltammetry using a three-electrode cell system at a scan rate of 5 mV/s, was 106 F/g for the aqueous electrolyte, and 114 F/g for the organic electrolyte. Higher specific capacitance in the organic electrolyte was obtained from the RH-derived AC, and was much higher than those of commercial ACs. The good compatibility with both the aqueous and organic electrolytes was attributed to the well-balanced micro- and mesoporosity. The role of the microporosity and mesoporosity on the capacitive performance of ACs in both electrolytes is also discussed. (C) 2013 Elsevier Ltd. All rights reserved.