Abstract
Supercapacitors display promising electrochemical performance with high power density and excellent cycle stability.However,their low energy density limits their advancement in a broader range of applications.To enhance their energy density,we proposed self-assembled spinel NiMn2S4 nanoflakes grown on nickel foam which we successfully prepared by a facile hy-drothermal method.The NiMn2S4 electrode delivers a high capacitance of 2096.7 F g-1 at 1.0 A g-1,with an exceptional rate capability(～720.6 F g-1 at a very high current density of 100 A g-1)and good cycle stability(～85.1％retention of the initial capacitance after 7000 cycles with the Coulombic eficiency around 100％).The as-fabricated asymmetric supercapacitors based on NiMn2S4 nanoflakes//active carbon demonstrate an energy density of 73.6 W h kg-1 at 800.5 W kg 1 and adequate cycling performance of～84.6％capacitance retention at 15 A g-1 after 10000 cycles.The results reveal that the nanostructured NiMn2S4 is an excellent electrode material for high-performance energy storage applications.
基金项目
Natural Science Foundation of Gansu,China(22YF7GA009)
Natural Science Foundation of Gansu,China(20JR10RA611)
Fundamental Research Funds for the Central Universities(Izujbky-2021 sp54)
维普
万方数据