超级电容器
碳纤维
材料科学
化学工程
水热碳化
电容
碳化
电流密度
功率密度
氯化物
化学
无机化学
复合材料
复合数
冶金
电极
扫描电子显微镜
工程类
功率(物理)
物理化学
物理
量子力学
作者
Zuozhao Zhai,Bin Ren,Yuelong Xu,Shasha Wang,Lihui Zhang,Zhenfa Liu
标识
DOI:10.1016/j.jpowsour.2020.228976
摘要
Carbon aerogels with low cost and eco-friendly are considered as ideal electrode materials for supercapacitors. In this investigation, nitrogen self-doped carbon aerogels (NSCA) are prepared by microwave hydrothermal and high-temperature carbonization using chitin as carbon and nitrogen sources. Zinc chloride is used as a dehydration agent and an activator. Owing to the low boiling point of Zinc chloride, it does not require any additional steps to remove the activator. Also, due to the activation of Zinc chloride, the specific surface area of NSCA reaches 2540 m2 g−1. In the three-electrode system, NSCA-1000 exhibits specific capacitance of 249.4 and 164.9 F g−1 at current densities of 1.0 and 10 A g−1, respectively. In the two-electrode system, the NSCA-1000 based symmetrical supercapacitor demonstrates an energy density and power density of 26.15 Wh kg−1 and 0.95 kW kg−1 at 1.0 A g−1, respectively. Meanwhile, NSCA-1000 displays excellent cycling stability that the specific capacitance can maintain 98.44% after 15,000 cycles at a current density of 2.0 A g−1.
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