材料科学
超级电容器
杂原子
化学工程
电化学
热解
微球
碳纤维
电容
电极
热液循环
比表面积
多孔性
复合材料
催化作用
有机化学
复合数
物理化学
化学
工程类
戒指(化学)
作者
Zhilan Lin,Jianhui Zhu,Peixin Zhang,Libo Deng
标识
DOI:10.1557/s43578-021-00210-9
摘要
Spherical carbonaceous materials are considered as ideal electrode materials for supercapacitors because of their high electrical conductivity and excellent electrochemical and mechanical stability. However, their overall performances are yet to be enhanced to meet the future demands. Herein, we prepared a supercapacitive carbon microsphere with hierarchical porous structure and doped them with both nitrogen and phosphor. This was achieved by a facile hydrothermal treatment of cyclodextrin, followed by pyrolysis in the presence of ammonium dihydrogen phosphate and finally by KOH activation. Benefiting from the porous microspheres structure, large surface area, and rich nitrogen and phosphorus heteroatoms, the as-prepared materials demonstrated excellent capacitive performance, with a specific capacitance of 182 F g−1 at 1.0 A g−1 and good rate performance as well as 100% retention after repeated charging and discharging for 5000 cycles, which are superior to the carbon microspheres without heteroatom doping.
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