Preparation And Characterization Of Ni-Co-G/NF Based On Jet Electrodeposition Technology

Traditional fossil fuels are non-renewable energy sources,and their reserves are gradually decreasing,which cannot meet the increasing energy consumption demand of today’s society.At the same time,fossil fuels when burned will produce smog,acid rain and other extremely bad natural disasters.Hydrogen energy is a renewable energy source with a wide range of sources,clean and environmental protection,good combustion stability,high calorific value,and diversified forms（gas,solid metal hydride,liquid）,which can meet the requirements of different storage environment and working environment.However,the excessive potential of ordinary hydrogen precipitation electrode is high,which greatly improves the energy consumption in the hydrogen precipitation process,while the precious metal electrode such as Pt and Pb is expensive,so it is difficult to be widely used in industrial hydrogen production.Therefore,it is of great significance to prepare a hydrogen precipitation electrode with low cost,good hydrogen precipitation performance and high stability.With nickel foam matrix on the surface of conductive composite material is greatly improve the effective means of electric catalytic performance of hydrogen electrode,and metal based conductive particle coating material is not only both the characteristics of matrix metal and conductive particles,also can set on the basis of the advantages,make the preparation of metal based conductive particle coating material performance is better.Nowadays,scholars often use powder metallurgy,electrodeposition and other technologies in preparing metal-based conductive particles coating materials,while relatively few studies prepare electrode composite materials.Jet electrodeposition technology is an optimized electrodeposition technology that uses the high-speed fluidity of the coating liquid to reduce the concentration difference polarization and improve the limit current density,which can improve the quality of the prepared coating material more efficiently,stably and economically.Therefore,the preparation of metal-based conductive particle coating will become a hot topic in the field of electrode preparation.In addition,graphene nanoparticles（G）themselves have high specific surface area and nano effect,which can not only effectively refine the metal coating of metal composite posites,but also improve the overall performance of the material by acting as enhanced phase particles of the coating material.Compared with ordinary metal-based electrodes,the unique 3-D mesh structure of nickel foam itself provides a great specific surface area,and can provide more electrochemical active area for the reaction during electrochemical hydrogen production.The preparation of metal-based conductive particles on the surface of nickel foam matrix can effectively improve the electrocatalytic activity of composite materials and the stability of hydrogen precipitation reaction.Ni and Co,as the transition family elements with good electrical conductivity,corrosion resistance,wear resistance and stability,have also been widely used in the electrode preparation industry.Therefore,this paper selects nickel foam as the electrode matrix and prepares Ni-Co-G/NF composite material on its surface by jet electrodeposition technology to combine the stability and high specific surface area of nickel foam matrix with the strong electrocatalytic activity of Ni-Co-G material to greatly improve the comprehensive performance of the hydrogen precipitation electrode.In order to analyze the influence of different coating components and preparation process parameters on the comprehensive performance of Ni-Co-G-NF material by injection electrodeposition technology,the control variable method is used to study different Co SO₄ additions and graphene particles on the characteristics of Ni-Co-G/NF material characteristics,Co-injection velocity and electrodeposition temperature.The Ni-Co-G/NF material was characterized and tested by scanning electron microscope（SEM）,X-ray diffractor（XRD）,tensile test machine,electrochemical workstation and other characterization instruments.According to the analysis results,the preparation conditions of Ni-Co-G materials are:Co SO₄ addition 30 g/L,graphene particles 10 g/L,cathode current density 50 A/dm²,injection speed 2 m/s,and electrodeposition temperature 45℃.The detection results of the characterization instrument show that the Ni-Co-G/NF material deposited on the Ni-Co-G/NF material prepared under the optimal plating ratio and optimal process parameters,the highest co-deposition of graphene particles,and the Ni-Co solid solvent grain size and closer cell arrangement.The mechanical and electrochemical properties of Ni-Co-G/NF materials prepared with optimal parameters showed the best mechanical properties,the highest electrocatalytic activity,the largest electrochemical reaction area,and strong electrochemical hydrogen precipitation stability.