Based on the principle that magnesium hydroxide is easily soluble in ammonium salt solution,v-NiCo2S4 was successfully grown on nickel foam by hydrothermal method,X-ray diffraction,electron scanning electron microscopy,electron transmission electron microscopy,X-ray photoelectron spectroscopy and electron paramagnetic resonance were used to characterize and analyze the morphology and structure of the samples,and the electrochemical properties were studied by cyclic voltammetry,constant current charge-discharge and electrochemical impedance tests using a three-electrode system.The specific capacitances of NiCo2S4@Mg(OH)2 and v-NiCo2S4-8 at a current density of 1 A·g-1 were 1 637 F∙g-1 and 2 437 F∙g-1,respectively,which proved that the introduction of cationic defects improved the electrochemical performance of the material.The v-NiCo2S4-8/AC asymmetric supercapacitor was assembled,and the device exhibited an energy density of 50.6 Wh∙kg-1 at a power density of 1 518.7 W∙kg-1.And after 5 000 cycles,it could still maintain 93.6%specific capacitance,showing good cycle stability.By introducing cation defects,the conductivity and ion diffusion ability of the material were improved,and the electrical storage performance of the material was improved.
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