Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare t...Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare the orthorhombic niobium oxide（T-Nb2O5） nanosheets supported on nitrogen and sulfur co-doped graphene（T-Nb205/NS-G） as anode for Li-HSCs. X-ray diffraction and morphological analysis show that the T-Nb2O5 nano sheets successfully and uniformly distributed on the NS-G sheets. The T-Nb2O5/NS-G hybrid exhibits great rate capability（capacity retention of63.1% from 0.05 to 5 A g^-1） and superior cycling stability（a low capacity fading of ～6.4% after 1000 cycles at 0.5 A g^-1）.The full-cell consisting of T-Nb2O5/NS-G and active carbon（AC） results in high energy density（69.2 W h kg^-1 at0.1 A g^-1）, high power density（9.17 kW kg^-1） and excellent cycling stability（95% of the initial energy after 3000 cycles）.This excellent performance is mainly attributed to the highly conductive NS-G sheets, the uniformly distributed T-Nb2O5 nano sheets and the synergetic effects between them. These encouraging performances confirm that the obtained TNb2O5/NS-G has promising prospect as the anode for Li-HSCs.展开更多
基金supported by the National Natural Science Foundation of China(21576138 and 51572127)China-Israel Cooperative Program (2016YFE0129900)+5 种基金Program for NCET-12-0629,PhD Program Foundation of Ministry of Education of China (20133219110018)the Natural Science Foundation of Jiangsu Province (BK20160828)Post-Doctoral Foundation(1501016B)Six Major Talent Summit (XNY-011)PAPD of Jiangsu Provincethe program for Science and Technology Innovative Research Team in Universities of Jiangsu Province,China
文摘Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare the orthorhombic niobium oxide（T-Nb2O5） nanosheets supported on nitrogen and sulfur co-doped graphene（T-Nb205/NS-G） as anode for Li-HSCs. X-ray diffraction and morphological analysis show that the T-Nb2O5 nano sheets successfully and uniformly distributed on the NS-G sheets. The T-Nb2O5/NS-G hybrid exhibits great rate capability（capacity retention of63.1% from 0.05 to 5 A g^-1） and superior cycling stability（a low capacity fading of ～6.4% after 1000 cycles at 0.5 A g^-1）.The full-cell consisting of T-Nb2O5/NS-G and active carbon（AC） results in high energy density（69.2 W h kg^-1 at0.1 A g^-1）, high power density（9.17 kW kg^-1） and excellent cycling stability（95% of the initial energy after 3000 cycles）.This excellent performance is mainly attributed to the highly conductive NS-G sheets, the uniformly distributed T-Nb2O5 nano sheets and the synergetic effects between them. These encouraging performances confirm that the obtained TNb2O5/NS-G has promising prospect as the anode for Li-HSCs.
