Design And Preparation Of Nickel Cobalt Oxide Electrode Material And Application Of Supercapacitor

Metal oxides attract scientists in the fields of electronics,medicine and chemistry due to their excellent physical and chemical properties.In the past two decades,extensive research has been conducted on its application in catalysis and green energy.The results from different studies show that compared with traditional energy materials,metal compounds with different structures and rich surface morphology can effectively enhance the conversion and storage of green energy.This article focuses on introducing nickel cobaltate and its composite materials based on nickel cobaltate.And by scanning electron microscope?SEM?,transmission electron microscope?TEM?,X-ray powder diffraction?XRD?and specific surface area analyzer?BET?and other methods to study the prepared electrode materials to determine its structure,morphology Composition characteristics.In addition,the electrochemical performance of electrode materials in 3.0 M KOH aqueous solution was studied by cyclic voltammetry?CV?,constant current charge-discharge?GCD?and electrochemical impedance spectroscopy?EIS?.The single compound NiCo₂O₄ was synthesized by simple hydrothermal method.Due to its low cost,environmental compatibility and high theoretical specific capacitance,the compound NiCo₂O₄ is a promising electrode for electrochemical capacitors.By characterization,NiCo₂O₄ has a lamellar floral spatial structure.As we all know,the performance of electrode is closely related to its structure.Through electrochemical tests,the highest specific capacitance was 942 F g^-1 when the current density was 0.5 A g^-1.And the cycling stability of the electrode was tested at the current density of 1 A g^-1,the specific capacitance retention rate was 85%when the current density was 1500 cycles.The chemical compound NiCo₂O₄ was further studied based on its excellent electrochemical properties.Block CuS was synthesized by etching and the two compounds were combined during the synthesis of compound NiCo₂O₄.Synthesis of complex NiCo₂O₄/CuS with novel block core-shell structure.The synthesized compounds have better electrochemical properties.Similarly,the maximum specific capacitance 2066 F g^-1 is displayed when the current density is 0.5 A g^-1.In addition,the capacitance retention rate of 88%is still maintained when the number of cycles increases to 5000 cycles.This is mainly due to the larger specific surface area of the composites and the high stability and high speed rate of the redox reaction.In addition,a new type of fluffy spherical NiCo₂O₄/CuS composite material was synthesized by hydrothermal method.When the current density is 0.5 A g^-1,the specific capacitance is as high as 2169 F g^-1.At the current density of 1 A g^-1 for 7000cycles of charge and discharge,the composite material also has 123%high cycle stability,which may be attributed to the synergic effect between CuS and NiCo₂O₄,which promotes electron transport and electrolyte ion diffusion.The two-in-one combination can improve the conductivity and charge storage capacity of the whole electrode structure.The composite material has more electrochemical active sites and its electrochemical performance is much higher than that of a single material.Moreover,the button-type supercapacitor device has significant electrochemical properties and can be used as a power source for red diodes?LED?.NiCo₂O₄/CuS composites as electrode materials for supercapacitors have great research prospects and application value.