Study On The Regulation And Properties Of NiCo₂O₄ Composite Micro-Nano Structure

With the continuous development of science and technology,the development of clean energy has been gradually valued and applied,the storage problem induced by energy exploitation has caused the attention of the scientific research personnel in energy storage device.The super capacitor as a new energy device is developed gradually,which has the characteristics of higher power density than conventional energy,but relatively low energy density have set back it's in the application.Due to the limited energy storage capacity of a single material supercapacitor.Based on the nickel foam which has grown nickel cobaltate,we continue to conduct the composite growth of another material,so as to improve the energy storage capacity of the material through composite means.The composite material can provide more active sites,enabling the redox reaction of the material to occur more rapidly to store charge.Through testing and characterization,the experimental results are as follows:(1)One-step hydrothermal synthesis of NiCo2O4 nanostructure,under the condition of1A·g^-1,the specific capacitance of the monomer is 158.7C·g^-1,and under 5A·g^-1,the retention rate of the monomer could be maintained at 100%after 10,000 cycles of testing.(2)Based on the synthesis of nickel cobaltate nanowires,the nickel molybdate nanowires continued to grow.The composite electrode has a specific capacitance of 685.7C·g^-1(1A·g^-1),an energy density of 96.3Wh·kg^-1,and a corresponding power density of 4050W·kg^-1.The specific capacitance of the device after assembly is 85.6C·g^-1(1A·g^-1).(3)The specific capacitance of nickel hydroxide nanocrystals grow on nickel cobaltate nanowirets is 687C·g^-1,and the retention rate of supercapacitors assembled into supercapacitors is 233C·g^-1 after 7,000 cycles under 10A·g^-1,the energy density reaches257Wh·kg^-1,and the retention rate after 10,000 cycles of charge and discharge is 92%after the power density reaches 2750W·kg^-1.(4)The zinc cobaltate nanosheets are deposited on the precursors of nickel cobaltate nanocones,and the specific capacitance of the composite electrode at 1A·g^-1 is 463.1C·g^-1.After repeated charge and discharge at 8A·g^-1,it still keeps 93%relative to the initial capacitance after 10000 cycles.The energy density and power density of the assembled asymmetric supercapacitor are 57.88Wh·kg^-1 and 449.94W·kg^-1,respectively.