Preparation Of Copper-manganese-based Nano-electrode Materials By Electrospinning And Study Of Their Electrochemical Properties

In recent years,due to a series of environmental pollution problems caused by increasing energy demand and the destruction of natural resources,which need to use environmental protection technology to maintain the normal development of society and reduce the impact of human activities on the environment.Therefore,energy storage systems have attracted widespread attention from researchers around the world.Compared with other electrochemical storage technologies,supercapacitors have the advantages of long cycle life,fast constant current charging and discharging rates.They are considered to be an environmentally friendly new energy storage method.It is the current development trend of energy storage system research.However,to achieve efficient energy storage,electrode materials with good energy storage characteristics must be developed and the preparation of electrode materials is the key to their performance.In this thesis,a series of copper-manganese-based nanomaterials were prepared by electrospinning and heat treatment,and their composition and morphology were characterized and analyzed by XRD,SEM,TEM,etc.Finally,its electrochemical performance was analyzed by electrochemical workstation.(1)Cu-MnO/CNF nanocomposites were prepared by electrospinning and heat treatment.From the microscopic morphology,the nano-particles of the ternary nanocomposite Cu-MnO/CNF have a high degree of dispersibility on the surface of the CNF.Compared with the CNF of the comparative sample unit,the binary composite Cu-CuO/CNF and MnO-Mn(OH)₂/CNF,its nanoparticles are evenly distributed and arranged neatly.In electrochemical experiments,the specific capacitance of the Cu-MnO/CNF composite electrode is higher than that of the cell and binary electrodes.At a scan speed of 5 m V/s,the specific capacitance of the Cu-MnO/CNF electrode is as high as 544 F/g.After cyclic voltammetry tests,the Cu-MnO/CNF composite electrode has a capacitance retention rate of more than 90%,while the capacitance retention rate of other electrodes is 80%-89%.(2)Cu-Mn₂O₃-TiO₂nanofiber materials were prepared by electrospinning and heat treatment.The experimental results show that the Cu-Mn₂O₃-TiO₂nanofiber material has complete ductility.Compared with the TiO₂,Cu-TiO₂and Mn₂O₃-TiO₂nanofiber materials,the fiber nanometer size is smaller,which improves the electrochemical performance of the electrode material.In the electrochemical experiment,the specific capacitance of the Cu-Mn₂O₃-TiO₂electrode is as high as 596 F/g at a scanning speed of 5 m V/s.After cycles of cyclic voltammetry test,the Cu-Mn₂O₃-TiO₂composite electrode has a capacitance retention rate of 95%,and the material exhibits more excellent cycle stability.(3)Cu₂O-Mn₃O₄-NiO ternary nanomaterials were prepared using copper acetate,manganese acetate and nickel acetate as raw materials,polyvinylpyrrolidone as a polymer surfactant,and N,N-dimethylformamide as a solvent.The metal oxide nanoparticles are arranged in an orderly manner to form a bead chain shape,which is conducive to good conductive connection between materials.Due to its unique structure,the specific capacitance of the Cu₂O-Mn₃O₄-NiO composite electrode is as high as 1306 F/g at a scanning speed of 5m V/s.Compared with the comparative NiO,Cu₂O-NiO,and Mn₃O₄-NiO electrodes,it has greatly improved The electrical capacity of the material.After cycles of cyclic voltammetry test,the Cu₂O-Mn₃O₄-NiO composite electrode has a capacitance retention rate of 94%.In summary,this article uses simple electrospinning and heat treatment to prepare a series of copper-manganese-based nanomaterials.In the electrochemical experiment,compared with a single material electrode,Cu-MnO/CNF nanocomposite,Cu₂O-Mn₂O₃-TiO₂nanofiber material and bead chain Cu₂O-Mn₃O₄-NiO nanomaterial electrode all showed excellent electrochemical performance.It shows that copper-manganese-based nanomaterials can be used as ideal materials for supercapacitor electrodes.