| With the decrease of fossil energy reserves and the increasingly severe environmental problems caused by the burning of a large number of fossil fuels,people begin to focus on the development of alternative green and environment-friendly energy sources（such as hydrogen,solar,wind,nuclear and other green and environment-friendly renewable energy sources）.Hydrogen energy is known as one of the cleanest energy sources because the hydrogen energy can be made from water and the combustion product is water.Water electrocatalysis for hydrogen production is an efficient way of hydrogen production.In industry,the commonly used electrolysis of water catalyst is mainly precious metal catalyst,and the status of high cost and low life of precious metal limits the further development of electrolysis of water.In recent years,due to its unique 3D electron orbits,transition metals have shown excellent electrochemical properties,which have been favored by the majority of researchers,showing the potential of substituting precious metals as electrolysis catalysts.Among the many factors that affect the performance of electrolytic water catalysts,three-dimensional nanostructure can effectively improve the specific surface area of the material,and thus increase the electrochemical activity area of the material to a certain extent,so that the catalyst shows excellent electrochemical activity.The development of new green and environmental protection energy cannot be separated from the development of clean energy such as solar,wind,water and so on.However,the development of these energy resources is susceptible to the influence of environmental factors such as climate,time,terrain and so on,which cannot provide stable energy output.The combination with energy storage equipment can effectively solve the impact of environmental factors.At present,battery is the main energy storage equipment used in industry（mainly lithium ion battery）.Compared with supercapacitor,the charging and discharging rate,and service life of battery are obviously lower.Many researchers believe that supercapacitor will replace battery and becomes the mainstream of the market in the future development of energy storage equipment.In this paper,the transition metal materials with 3D nanostructure are taken as the research object.Different transition metal nanomaterials are synthesized using the self-template method.The applications in water electrocatalysis and supercapacitor energy storage are studied.The obtained results are as follows:1)Ni（PO3）2-MnPO4 nanosheets（Ni（PO3）2-MnPO4/NF）supported on nickel foam is synthesized by simple hydrothermal method using Ni（OH）2-Mn（OH）2 nanosheets array（NiMn LDH/NF）supported on nickel foam as precursor for the first time.The synergistic effect between Ni-Mn makes the material exhibit better water electrocatalysis and supercapacitor energy storage performance.The structure of 3D nanosheets array effectively increases the electrochemical active area of the material,enhances the REDOX reaction of the material,and makes the material show more excellent electrochemical properties.This method provides more ideas for the synthesis of materials in the future:composite metal phosphating compound with excellent electrochemical properties can be obtained through phosphating reaction with nanosheets array of composite metal as precursor.2)Layered nanosheets（Ni（OH）2-MnO2/NF）constructed from Ni（OH）2-MnO2nanowires supported on nickel foam is synthesized by hydrothermal method using MnO2nanosheets as template.The assembly of nanowires and nanosheets can increase the porosity of the material,increase the contact between the active material and the electrolyte,and thus increase the capacitance of the material.3)The 3D NiS-Ni3S2-NiP nanorods cluster（NiS-Ni3S2-NiP/NF）supported on nickel foam is synthesized by hydrothermal method using Ni（OH）2 supported on foam nickel in coralloid form as template with NaH2PO4 as phosphorus source,thioacetamide as sulfur source.NiS-Ni3S2-NiP/NF exhibits excellent water electrocatalysis performance in alkaline solution.The method of the one-step synthesis of dianionic compounds provides more ideas for the synthesis of dianionic compounds. |
