材料科学
超级电容器
共晶体系
多孔性
化学工程
比表面积
碳纤维
兴奋剂
生物量(生态学)
电池(电)
冶金
复合数
电容
复合材料
有机化学
电极
光电子学
功率(物理)
物理化学
微观结构
催化作用
化学
量子力学
工程类
地质学
物理
海洋学
作者
Daohai Zhang,Xiao Zhan,Teng Zhou,Jingyu Du,Kaixiang Zou,Yingchun Luo
标识
DOI:10.1016/j.jmst.2024.01.019
摘要
N/B co-doped porous carbon materials (NBPCs) are regarded as an ideal cathode material for Zn-ion hybrid supercapacitors (ZHSCs). As a capacitive cathode material, the improvement of specific surface area (SSA) and pore structure can efficiently enhance the capacity and rate capability of NBPCs. However, the B atom doping progress will patch up the defect and pore of NBPCs, thereby impeding the further expansion of the SSA area and porous structure. This paper designs a new route for high-efficiency fabrication of NBPCs with high SSA and rich pore structure, employing biomass waste as the carbon source and a novel deep eutectic solvent (DES) as the activation agent. The obtained NBPCs process superior SSA (2270 m2 g–1) and abundant pore structure with rich B, N-doping level. Notably, an interesting occupied effect of doped B atoms on the N-doped carbon network can be identified, which optimizes the proportion of N-contained surface functional groups, leading to the enhancement of conductivity and capacity in NBPCs. Together with the large SSA, high B, N-doping level, an appropriate proportion of N-contained surface groups, and hierarchical porous structure, the NBPC-3 sample exhibits excellent electrochemical performance as cathode materials for ZHSCs, with an energy density of 139.46 W h kg–1.
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