超级电容器
碳化
活性炭
电极
功率密度
电流密度
材料科学
碳纤维
生物量(生态学)
电解质
化学工程
比表面积
化学
电容
复合材料
功率(物理)
复合数
有机化学
吸附
工程类
物理
地质学
海洋学
物理化学
扫描电子显微镜
催化作用
量子力学
作者
Bo Wei,Tiantian Wei,Caifeng Xie,Kai Li,Fangxue Hang
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2021-01-01
卷期号:11 (45): 28138-28147
被引量:16
摘要
We present a simple, low-cost method for producing activated-carbon materials from sugarcane tips (ST) via two-step pre-carbonization and KOH activation treatment. After optimizing the amount of KOH, the resulting ST-derived activated carbon prepared with a KOH to PC-ST mass ratio of 2 (ACST-2) contained 17.04 wt% oxygen and had a large surface area of 1206.85 m2 g-1, which could be attributed to the large number of micropores in ACST-2. In a three-electrode system, the ACST-2 electrode exhibited a high specific capacitance of 259 F g-1 at 0.5 A g-1 and good rate capability with 82.66% retention from 0.5 to 10 A g-1. In addition, it displayed a high capacitance retention of 89.6% after 5000 cycles at a current density of 3 A g-1, demonstrating excellent cycling stability. Furthermore, the ACST-2//ACST-2 symmetric supercapacitor could realize a high specific energy density of 7.93 W h kg-1 at a specific power density of 100 W kg-1 in 6 M KOH electrolyte. These results demonstrate that sugarcane tips, which are inexpensive and easily accessible agricultural waste, can be used to create a novel biomass precursor for the production of low-cost activated carbon materials for high-performance supercapacitors.
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