Preparation And Research On Supercapacitor Properties Of Cobalt-Based Nanomaterials

As a promising electrode material for supercapacitors,cobalt-based nanomaterials have the advantages of fast ion and electron transmission and high environmental compatibility.However,the actual capacity is lower than the theoretical capacity in practical application.Aiming at this problem,this paper studies the structure regulation and optimization of cobalt-based nanomaterials and the performance of supercapacitors,the specific experiments are as follows:By chemical bath deposition growth the cobalt oxide nanorods array（Co₃O₄）,the diameter of the nanorods is about 450 nanometers,nickel foam was used as base material,improve the conductivity of the electrode material,under the current density of 1 A g^-1the specific capacitance value can reach 387.25 F g^-1(154.9 C g^-1),after 1000 times charging and discharging cycle,capacity retention rate can reach88%,the improved electrochemical performance can be attributed to the array structure,nanorods increase the gap between the ion diffusion velocity in the electrolyte.On the basis of the cobalt oxide,adopt the method of phosphide growth phosphating cobalt nanorod arrays materials（Co₂P）,the material in 10 m A cm^-2current density to devolve electricity specific capacity can reach 6250 m F cm^-2,under 20 m A cm^-2current density of circular 10000 laps can keep 84.7%of capacity,on the basis of the electroplating a layer of PEDOT,the electrochemical test the performance of electrode materials,electrochemical performance has improved.The PEDOT@Co₂P nanorod array structure exhibits better cycling performance.The current density of 10 m A cm^-2can be up to 9250 m F cm^-2,and the current density of20 m A cm^-2can still maintain the capacity of 93.4%after 10000 cycles.It is because of PEDOT’s conductive support and cladding,which inhibits the shedding of active materials on the surface of nanorods.With the method of hydrothermal and phosphating,a layer of Ni Co P nano-honeycomb can be grown evenly on the foamed nickel.It can be used as a self-supporting electrode.In the electrochemical performance compared with the electrolyte concentration,cobalt nickel phosphorus potassium hydroxide nanometer honeycomb in 3 mol L^-1concentrations of electrochemical performance is best,current density of 10 m A cm^-2,specific capacitance value can reach 1813 m F cm^-2,in the current density of 20 m A cm^-2,cycle test 10000 laps,specific capacitance still reaches to 82.91%of the initial capacity,appropriate electrolyte concentration peak can make the capacitance values of electrode materials.The electrolyte and electrode material are more compatible.