超级电容器
碳化
比表面积
介孔材料
材料科学
碳纤维
化学工程
电化学
蜂巢
多孔性
蜂窝结构
纳米技术
化学
复合材料
电容
复合数
电极
物理化学
工程类
扫描电子显微镜
有机化学
催化作用
作者
Feng Wang,Lian Chen,Huiling Li,Gaigai Duan,Shuijian He,Lin Zhang,Guoying Zhang,Zhengping Zhou,Shaohua Jiang
标识
DOI:10.1016/j.cclet.2020.02.020
摘要
Biomass-derived porous carbon with developed pore structure is critical to achieving high performance electrode materials. In this work, we report a grape-based honeycomb-like porous carbon (GHPC) prepared by KOH activation and carbonization, followed by N-doping (NGHPC). The obtained NGHPC exhibits a unique honeycomb-like structure with hierarchically interconnected micro/mesopores, and high specific surface area of 1268 m2/g. As a supercapacitor electrode, the NGPHC electrode exhibits a remarkable specific capacitance of 275 F/g at 0.5 A/g in a three-electrode cell. Moreover, the NGHPC//NGHPC symmetric supercapacitor displays a high energy density of 12.6 Wh/kg, and excellent cycling stability of approximately 95.2% capacitance retention after 5000 cycles at 5 A/g. The excellent electrochemical performance of NGHPC is ascribed to its high specific surface area, honeycomb-like structure and high-content of pyrodinic-N (36.29%). It is believed that grape-based carbon materials show great potential as advanced electrode materials for supercapacitors.
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