Preparation And Supercapacitor Properties Of High-performance Bimetallic Compound Nanostructured Materials

Supercapacitors has the characteristics of wide working temperature range,long working life,and short time required for charging and discharging,so it has aroused widespread concern in the society..Bimetallic compounds are inexpensive,environmentally friendly,have high electrochemical activity and a large theoretical specific capacitance,and are considered to be one of the most potential supercapacitor electrode materials.In this paper,a series of composite materials and nanoarray structures based on bimetallic compounds were prepared by hydrothermal method.On this basis,solid supercapacitors were assembled and electrochemical test analysis was carried out:1.In this paper,a one-step hydrothermal method was used to prepare MnMoO₄nanosheet arrays grown on a nickel foam substrate.The NF@MnMoO₄//AC device assembled by it achieves a high energy density of 107.38 Wh/kg at a power density of801.34 W/kg,and an energy density of 72.18 Wh/kg at a power density of 3987.85W/kg.The successful preparation of self-charging integrated systems based on ASCs and commercial solar cells shows that NF@MnMoO₄ material has a very good application prospect as a self-powered energy collection-storage system electrode.2.In this paper,the carbon-doped Ni Co₂O₄ nanowires were directly prepared on the nickel foam substrate by hydrothermal method.When the current density increased from 3A/g to 10A/g,the capacitance retention rate of Ni Co₂O₄electrode was 94.28%,and the specific capacitance was 7144.86F/g when the current density was 3A/g.The precursor slowly released crystalline water and carbon dioxide gas during the pyrolysis process and left pores in the original structure.The generation of these mesopores makes the specific surface area of the electrode material significantly increase,and the electrode active material can fully participate in the Faraday reaction,thereby improving the capacitance performance of the electrode material.The carbon doping effectively buffers the volume expansion in the rapid Faraday reaction,and improves the stability of the electrode material without destroying the crystal structure.This shows that the material has high specific capacity,good rate performance,and low preparation cost,so it has broad development prospects.3.In this paper,a one-step hydrothermal method is used to prepare C-Co-Ni-S-P electrode materials.The electrode load is 2.86g/cm2,and the area specific capacity can reach 9.099F/cm2 at a current density of 3A/g.Phosphating treatment of the sample can improve the mass specific capacity while retaining the high load,high area specific capacity and good conductivity provided by the vulcanization process to a certain extent.It can be seen that the phosphating treatment is an effective means to improve the performance of the electrode material.