Study On The Growth And Application Of Cathode Fractal Structure In Electrolytic Copper

Copper is widely used in electrical engineering,communication,machinery manufacturing,building materials and national defense industry,so it is a very important resource.However,metal copper exceeds supply in our country,belongs to scarce resource.Electrolytic copper is one of the important methods to prepare copper metal.However,due to the bending of electric field lines and the disturbance of electrolyte in the high curvature interface such as the edge of cathode plate,the nonlinear and non-equilibrium state characteristics of plate edge are very obvious,resulting in the complex fractal structure of copper.Copper fractal structure has the characteristics of high specific surface area,short charge transfer path and good conductivity,so it has good applications in the fields of catalyst,sensor,energy storage,photothermal devices and so on.Therefore,it is very important to regulate the fractal growth in electrolytic copper.In this paper,the growth behavior of the fractal structure in the electrodeposition process of copper metal is taken as the regulation objective,to explore the influence of electrodeposition conditions on the morphology of the fractal structure under the condition of multiple fields,and to reveal the growth law of the dendrite.In order to simplify the growth characteristics of dendrite,the limited domain of dendrite is studied in two dimensions.Based on the copper dendrite,Cu O/Cu dendrite photothermal materials were prepared by in situ oxidation calcination and loaded with copper oxide nanowires on the Cu dendrite.The photothermal properties of Cuo/Cu dendrite were studied and its application prospects were explored.The research focus of this paper mainly includes the following three aspects:(1)Aiming at the fractal growth of planar two-dimensional thin layer Cu dendrite,the effects of externally controlled growth conditions,such as current intensity,growth time and electrolyte concentration,on the morphology of 2D-Cu dendrite were systematically investigated through the thin layer reactor.The DLA model was modified by introducing ion electric field oriented electromigration,and the electrodeposition process of 2D-Cu dendrite was simulated by MATLAB,and the fractal growth mechanism was proposed.Cu O/2D-Cu dendrite photothermal material was prepared by in situ oxidation calcination,and its photothermal properties were investigated.The results show that the temperature of Cu O/2D-Cu dendrite photothermal material can reach 34℃when the apparent area is only 0.15 cm~2.(2)In order to achieve the fractal growth of three-dimensional Cu dendrite,a three-dimensional array of copper fractal structures was electrodeposited on the fibers in an immersion reactor.The effects of current intensity,electrodeposition time and electrolyte concentration on the morphology of 3D-Cu dendrite were systematically investigated.Using 3D-Cu dendrite as substrate,Cu O/3D-Cu dendrite photothermal materials were prepared by in situ oxidation calcination and loading Cu O nanowires on3D-Cu dendrite.Combining the traditional embroidery technique,the Cu O/3D-Cu dendrite photothermal material of fiber structure is combined with the fabric to prepare the flexible wearable fabric with photothermal effect.By adjusting the number of photothermal fibers,the temperature of the whole photothermal fabric can be adjusted in the range of 35-65℃.(3)Aiming at the fractal growth of three-dimensional Cu-Ni fractal structure,a three-dimensional array of Cu-Ni fractal structure was successfully obtained by electrodeposition on fibers in an immersion reactor.The effects of electrodeposition voltage,concentration ratio of copper ions to nickel ions in electrolyte and other growth conditions on the morphology of three-dimensional Cu-Ni fractal structure were systematically investigated.The catalytic properties of Cu-Ni fractal structure and their advantages and disadvantages were preliminarily investigated.