多孔花状异质结构NiCo2O4/Co3S4-M:制备及其非对称超级电容器性能OA

Supercapacitors demonstrate significant application potential in the energy storage field due to their high power density,rapid charge-discharge capability,and long cycle life.However,their relatively low energy density restricts further development.In this study,porous flowerball-like NiCo2O4/Co3S4-M heterostructured electrode materials were constructed via hydrothermal method,template-assisted growth,and sulfuration treatments,and their electrochemical performance was systematically investigated.In a three-electrode system,NiCo2O4/Co3S4-M exhibits a specific capacitance of 2362 F·g-1 at 1 A·g-1.The porous flowerball structure affords abundant active sites,and the heterointerface facilitates electron/ion transport,synergistically boosting both conductivity and stability.Furthermore,an asymmetric supercapacitor(NiCo2O4/Co3S4-M//PC)was assembled using porous flowerball-like NiCo2O4/Co3S4-M as the cathode and porous carbon(PC)as the anode,achieving a high energy density of 98.40 Wh·kg-1 at a power density of 375 W·kg-1,which maintained 45.42 Wh·kg-1 even at a power density of 7500 W·kg-1,along with outstanding cycling stability.After 10000 cycles at a current density of 5 A·g-1,the capacitance retention rate reached 99.7%with a Coulombic efficiency of 97.56%.This study indicates that the strategy of heterostructure design and microstructure modulation can effectively achieve high specific capacity and superior cycling stability,providing new research insights for the development of high-performance supercapacitor electrode materials.