超级电容器
碳化
材料科学
介孔材料
碳纤维
电容
化学工程
活性炭
超声
比表面积
微型多孔材料
储能
石墨烯
纳米技术
电极
复合材料
化学
吸附
有机化学
扫描电子显微镜
催化作用
复合数
物理化学
工程类
物理
功率(物理)
量子力学
作者
Dewei Yang,Huijuan Jing,Zhaowu Wang,Jiaheng Li,Mingxiang Hu,Ruitao Lv,Rui Zhang,Deliang Chen
标识
DOI:10.1016/j.jcis.2018.05.050
摘要
Activated carbon (AC) based supercapacitors exhibit intrinsic advantages in energy storage. Traditional two-step synthesis (carbonization and activation) of AC faces difficulties in precisely regulating its pore-size distribution and thoroughly removing residual impurities like silicon oxide. This paper reports a novel coupled ultrasonication-milling (CUM) process for the preparation of hierarchically porous carbon (HPC) using corn cobs as the carbon resource. The as-obtained HPC is of a large surface area (2288 m2 g-1) with a high mesopore ratio of ∼44.6%. When tested in a three-electrode system, the HPC exhibits a high specific capacitance of 465 F g-1 at 0.5 Ag-1, 2.7 times higher than that (170 F g-1) of the commercial AC (YP-50F). In the two-electrode test system, the HPC device exhibits a specific capacitance of 135 F g-1 at 1 A g-1, twice higher than that (68 F g-1) of YP-50F. The above excellent energy-storage properties are resulted from the CUM process which efficiently removes the impurities and modulates the mesopore/micropore structures of the AC samples derived from the agricultural resides of corn cobs. The CUM process is an efficient method to prepare high-performance biomass-derived AC materials.
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