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 stru...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 m^(2)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).展开更多
基金supported by the National Natural Science Foundation of China Project(No.52163001)the Guizhou Minzu University Research Platform Grant(No.GZMUGCZX[2021]01)+1 种基金the Guizhou Provincial Science and Technology Program Project Grant(Nos.Qiankehe Platform Talents-CXTD[2021]005Qiankehe Platform Talents-GCC[2022]010-1).
文摘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 m^(2)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).
