Based On The Preparation Of Copper Hydroxide Nanorod Array Electrode Materials And The Study Of Capacitance Performance

The continually increasing demand for clean energy and the growing global environmental concerns have attracted growing demand for efficient energy storage devices.Supercapacitors（SCs）,as a new type of energy storage device,have aroused widespread attention from both academia and industry due to their superior power density,fast charge and discharge rates,excellent rate capability,long cycle life and so on.The structure and electrochemical properties of electrode materials are very crucial for supercapacitors to achieve an excellent electrochemical performance.Therefore,designing and synthesizing electrode materials with desirable structures and outstanding electrochemical performances have been consistently pursued as an important task for the development of high performance supercapacitors.Transition metal（nickel,cobalt,copper,zinc,etc.）based composites,such as oxides,hydroxides and carbonate hydroxides（CHs）,have important research significance and application value in the field of capacitors due to their special electrochemical activity,abundant reserves,good stability and so on.In this paper,the copper hydroxide（Cu（OH）₂）nanorod arrays were grown directly on a three-dimensional porous copper foam substrate by in situ oxidation,and then used them as templates and precursors to prepare different electrode materials,including CVO Cu@CuO composite prepared by cyclic voltammetry oxidation（CVO）method,Cu（OH）₂@ZnNi-CoCH composite prepared by hydrothermal method and Cu₂₊₁O@NiCoAl-LDH composite prepared by hydrothermal method.The electrochemical properties of these composites were studied and also applied these composites to supercapacitors as electrode materials.Details are as follows:1.The CVO CuO nanorod arrays with a hierarchical structure was directly prepared on the three-dimensional conductive copper foam by in situ oxidation method, calcination treatment and cyclic voltammetry oxidation in turn.The prepared CVO Cu@CuO nanorod arrays composite was directly used to prepare a binderless electrode.Compared with ordinary powder electrodes,the hierarchical CuO nanorod arrays surrounded by numerous ultra-thin CuO nanosheets have better structural stability,more electrochemical active sites,more efficient utilization of active materials and faster diffusion performance,thus exhibits excellent capacitance performance.2.A three-dimensional hierarchical Cu（OH）₂@ZnNi-CoCH composite was successfully prepared by a simple hydrothermal method using Cu（OH）₂ nanorod arrays as both the template and precursor.A layer of Zn and Ni co-substituted Co carbonate hydroxide（ZnNi-CoCH）nanothorns were grown uniformly on the surface of the Cu（OH）₂ nanorods.Due to the large specific surface area provided by hierarchical structure and the synergistic effect of various metal elements in ZnNi-CoCH,the target product Cu（OH）₂@ZnNi-CoCH exhibits excellent capacitive properties.3.A three-dimensional hierarchical Cu₂₊₁O@NiCoAl-LDH composite was successfully prepared by a simple hydrothermal method using Cu（OH）₂ nanorod arrays as both the template and precursor.A uniform layer of Ni,Co and Al layered double hydroxide（NiCoAl-LDH）nanosheets were grown on the surface of nanorods as the Cu（OH）₂ nanorods were transformed into Cu₂₊₁O nanorods.The Cu₂₊₁O@NiCoAl-LDH composite exhibits excellent capacitance performance because of the unique nanorod array structure and hierarchical structure,and the hybrid supercapacitor device prepared by using the composite as the positive electrode material achieves ultra-high energy density.