Preparation Of Three-dimensional Ordered Macroporous Nickel-based Materials And Researches On Their Energy Storage And Discoloration Properities

With the rapid growth of global economy,people's demand for energy is also increasing,and the development of renewable green new energy has become a major theme of the current era.As a kind of energy storage material,the advantages of supercapacitor electrode material,such as high power density and long cycle life,have attracted the attention of researchers.Among the many energy storage materials,nickel oxide stands out because of its high theoretical capacity,low cost,abundant sources and great application prospect.Through the study of its energy storage and color changing properties,it is of certain value for the preparation of intelligent energy storage devices.In this paper,the preparation methods of the porous electrode materials are based on reference,the colloidal crystal template method is combined with electrodeposition method for the preparation of three-dimensional ordered macro-porous(3 DOM)nickel material,one is to study the optical properties with the help of simulation and practical test,another one is to prepare a porous metal current collector,and the nickel oxide is loaded onto the surface of it by solvent hot method,eventually,the 3 DOM nickel/nickel oxide core-shell structure electrode materials are prepared,and the energy storage capacity is also explored.Firstly,three-dimensional ordered arrangement polystyrene colloidal crystal template is prepared by vertical deposition method,the nickel nanoparticles are filled into the template gap with the help of template auxiliary electrodeposition method(two electrode system).To get different thickness of 3 DOM nickel materials,the current density and the deposition time in the process of electrodeposition are adjusted,then the template gets removed,and finally the 3 DOM nickel material is prepared The relationship between microsphere aperture,current density,electrodeposition time and the structure and optical properties of 3 DOM nickel is also studied,in order to further explore the relation of the 3 DOM microstructure change and its optical properties,the optical simulation is involved.The results show that the more overlaps of polystyrene microspheres in colloidal crystal template,the larger size of 3 DOM nickel skeleton "circular window",and the reflectance of film gets increased as well.Subsequently,the nickel oxide nanoparticles are loaded onto the 3 DOM nickel film material by hydrothermal growth method,and evevtually a core-shell structure electrode material is prepared.The electrochemical parameters are adjusted to test its energy storage capacity.With different activation treatment of 3 DOM nickel/nickel oxide electrode materials,the influence to the electrochemical properties are studied,and the study shows that: with the increase of activation laps for the materials,the specific capacitance values get increased.When the activation management is under the current density at 1 m A/cm2 after 1000 laps,the specific capacitance of material can reach 827.3 m F/cm2,impedance test analysis indicate that the resistance of electrode materials are small and has no obvious change,which shows that activation treatment has no influence on the electrical conductivity of the material,and thus help to increase the capacitor performance.Further simulation analysis shows that the presence of nickel oxide in the surface layer would reduce the reflectance of 3 DOM nickel film.With the increase of the absorption coefficient of nickel oxide,the reflectance of 3 DOM nickel/nickel oxide composite film would increase gradually.