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Facile synthesis of NiMn2S4 nanoflakes on nickel foam for high-performance aqueous asymmetric supercapacitors

查看全文 作　　者：ADIL [1]Emin;LI [1]YaLi;GAO [1]Zhe;DONG [1]YunXia;LI [1]DongHao;CHEN [1]YongChao;FU [1]YuJun;HE [1]DeYan;LI [1]JunShuai 高影响力作者 机构地区：[1]LONGi Institute of Future Technology,and School of Materials&Energy,Lanzhou University,Lanzhou 730000,China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2024年第67卷第2期,共10页高影响力期刊 基　　金：partly supported by the Natural Science Foundation of Gansu,China(Grant Nos.22YF7GA009 and 20JR10RA611);the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2021 sp54)。 摘　　要：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 NiMn2S4nanoflakes grown on nickel foam which we successfully prepared by a facile hydrothermal method.The NiMn2S4electrode 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 efficiency around 100%).The as-fabricated asymmetric supercapacitors based on NiMn2S4nanoflakes//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 NiMn2S4is an excellent electrode material for high-performance energy storage applications. 关 键 词：NiMn2S4 nanostructure high capacitance aqueous supercapacitors long cycle stability high energy density
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