Herein,we reasonably designed MOF-derived Co_(9)S_(8)polyhedrons coated on NiCo_(2)S_(4)nanowire compo-sites for high performance hybrid supercapacitors.The NiCo_(2)S_(4)nanowires have one-dimensional struc-ture that ...Herein,we reasonably designed MOF-derived Co_(9)S_(8)polyhedrons coated on NiCo_(2)S_(4)nanowire compo-sites for high performance hybrid supercapacitors.The NiCo_(2)S_(4)nanowires have one-dimensional struc-ture that can provide better electronic transmission characteristics and Co_(9)S_(8)polyhedrons modified on nanowires can further expand the contact surface area and increase active sites of the Faraday reaction.Besides,the proportion of components can be adjusted and optimized by controlling the reaction time.The synergistic effects between the two components significantly improve their pseudocapacitance.The test results indicated that the specific capacitance of the NiCo_(2)S_(4)/Co_(9)S_(8)electrode with an optimal ratio can reach up to 2390.2 F g^(−1)(331.8 mA h g^(−1))at a current density of 1 A g^(−1).Even when the current density increased to 10 A g^(−1),its rate performance was still maintained at 88.2%.A hybrid supercapacitor was assembled with NiCo_(2)S_(4)/Co_(9)S_(8)and activated carbon shows a high energy density of 47.7 W h kg^(−1) when the power density is 1275 W kg^(−1),as well as good cycle stability(84.1%capacitance retention after 8000 charging/discharging cycles).Therefore,this device has a potential practical space in portable energy storage devices.展开更多
基金upported by Jiangsu Province Postdoctoral Science Foundation(2020Z247)the Innovation Entrepreneurship Program of Jiangsu Province(Suren caiban[2016]32)+1 种基金the National Natural Science Foundation of China(21878129)the Industry Prospect and Key Core Technology(Competition Project)of Jiangsu Province(BE2019093)。
文摘Herein,we reasonably designed MOF-derived Co_(9)S_(8)polyhedrons coated on NiCo_(2)S_(4)nanowire compo-sites for high performance hybrid supercapacitors.The NiCo_(2)S_(4)nanowires have one-dimensional struc-ture that can provide better electronic transmission characteristics and Co_(9)S_(8)polyhedrons modified on nanowires can further expand the contact surface area and increase active sites of the Faraday reaction.Besides,the proportion of components can be adjusted and optimized by controlling the reaction time.The synergistic effects between the two components significantly improve their pseudocapacitance.The test results indicated that the specific capacitance of the NiCo_(2)S_(4)/Co_(9)S_(8)electrode with an optimal ratio can reach up to 2390.2 F g^(−1)(331.8 mA h g^(−1))at a current density of 1 A g^(−1).Even when the current density increased to 10 A g^(−1),its rate performance was still maintained at 88.2%.A hybrid supercapacitor was assembled with NiCo_(2)S_(4)/Co_(9)S_(8)and activated carbon shows a high energy density of 47.7 W h kg^(−1) when the power density is 1275 W kg^(−1),as well as good cycle stability(84.1%capacitance retention after 8000 charging/discharging cycles).Therefore,this device has a potential practical space in portable energy storage devices.
