Preparation of mesoporous carbon spheres with a bimodal pore size distribution and its application for electrochemical double layer capacitors based on ionic liquid as the electrolyte
Preparation of mesoporous carbon spheres with a bimodal pore size distribution and its application for electrochemical double layer capacitors based on ionic liquid as the electrolyte
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双峰孔径分布介孔碳球的制备及其在离子液体电解质双层电容器中的应用
DOI：
10.1016/j.micromeso.2011.10.023
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发表时间：
2012-03
影响因子：
5.2
通讯作者：
Li, Yanqiu
中科院分区：
文献类型：
--
作者：
Sun, Guohua;Li, Kaixi;Xie, Lijing;Wang, Jianlong;Li, Yanqiu
以酚醛树脂为碳前驱体，采用悬浮聚合和水蒸气活化法制备了具有双峰孔径分布的介孔碳球。所得碳球的比表面积为1006m2g−1，总孔容为1.34cm3g−1，中孔率为81.3%，平均孔径为5.33 nm。碳材料的孔径分布呈双峰分布(3.5 nm和23.8 nm)。在离子液体1-乙基-3-甲基咪唑四氟硼酸盐([EMIM]BF4)中，碳球的比电容为147Fg−1，电流密度为2mAcm−2，电极/电解液界面阻抗较小。此外，在一些特殊情况下，获得了比能量为20Wkg−1，比功率为3100Wkg−1。
Mesoporous carbon spheres with a bimodal pore size distribution were prepared by suspension polymerization and steam activation method using phenol–formaldehyde resins as a carbon precursor. The as-prepared carbon spheres had a specific surface area of 1006m2g−1, total pore volume of 1.34cm3g−1, mesoporous ratio of 81.3% and average pore size of 5.33nm. Moreover, the carbon material showed a bimodal pore size distribution (3.5 and 23.8nm). We found a high specific capacitance of 147Fg−1for the carbon spheres in ionic liquid 1-ethyl-3-methylmidazolium tetrafluoroborate ([EMIm]BF4) at a current density of 2mAcm−2and small impedance at the interface of electrode/electrolyte. In addition, a specific energy of 20Whkg−1at a specific power of 3100Wkg−1was obtained in some particular cases.
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