【摘 要】
：
High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid (BSH) devices.Herein,a core-shell structure of the hollow mesoporous carbon spheres (HMCS) supported NiSe2 nanosheets (HMCS/NiSe2) is constru
【机 构】
：
Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices,School of Microelectronics and F
论文部分内容阅读
High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid (BSH) devices.Herein,a core-shell structure of the hollow mesoporous carbon spheres (HMCS) supported NiSe2 nanosheets (HMCS/NiSe2) is constructed through two-step reactions.The HMCS/NiSe2 shows a max specific capacity of 1,153.5 C·g-1 at the current density of 1 A·g-1,and can remain at 774.5 C·g-1 even at 40 A·g-1 (the retention rate as high as 67.1％) and then the HMCS/NiSe2 electrode can keep 80.5％ specific capacity after 5,000 cycles at a current density of 10 A·g-1.Moreover,the density functional theory (DFT)calculation confirmed that the introduction HMCS into NiSe2 made adsorption/desorption of OH-easier,which can achieve higher rate capability.The HMCS/NiSe2//6 M KOH//HMCS hybrid device has energy density of 47.15 Wh·kg-1 and power density of 801.8 W·kg-1.This work provides a feasible electrode material with a high rate and its preparation method for high energy density and power density energy storage devices.
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