Simulation Study On Preparation Of Copper Base Composite Electrodeposited Layer

Hydrogen is a sustainable and environmentally friendly energy,and its preparation technology has become a research hotspot.At present,electrolytic water is an effective way to produce hydrogen.The composite electrodeposition technology is an effective way to develop new electrolytic water catalytic materials by loading functional materials with particles on metal base surface.At present,most of the research work on composite electrodeposition focuses on the process and properties of electrolytic water catalytic materials prepared by composite electrodeposition,but little is known about the mechanism of particle transport,electric field characteristics and flow field characteristics in the process of composite electrodeposition of electrolytic water catalytic materials.Therefore,in order to explore these problems,the particle transport law,electric field characteristics and flow field characteristics of composite electrodeposition process were simulated in this paper from the direction of multiphysical field coupling numerical simulation.This paper mainly carried out the following research work:In the outer boundary layer region,the relationships between the velocity of the flow field and the distribution of ion concentration in electrodeposited liquid,the thickness of the boundary layer and the transport law of particles are simulated.In the outer region of the copper base boundary layer,the flow field plays a dominant role,so the particle size,zeta potential and particle conductivity have no obvious difference in the change of the flow field at the macro level.The current density on the electrode surface is affected by the velocity of the flow field.With the acceleration of the flow field velocity,the current density distribution on the electrode surface tends to be uniform.With the increase of flow velocity,the concentration of Ni ion on the cathode surface increases.In the inner boundary layer region,the influence of physical and chemical properties of particles on particle transport,the relationship between electrochemical parameters and particle transport law,and the electrochemical characteristics of inner boundary layer region were studied.The higher the zeta potential,the shorter the transport time to the cathode.The larger the particle size,the larger the amount of charge carried on the surface of the particle,and the greater the power received in the transport process.When the power is dominant,the larger the particle size,the shorter the transport time to the cathode.When gravity is dominant,the transport time of particles to the cathode surface increases.The current density on the electrode surface decreases and the current density on the cathode surface tends to be uniformly distributed with the increase of the flow velocity of electrodeposited liquid.On the surface of copper base,the relationship between the properties of particles and the macroscopic dynamics of composite electrodeposition and the growth of nickel dendrites was studied.When more particles are deposited on the surface of copper substrate,more lateral dendrites grow in nickel dendrites,which is conducive to the transverse growth of nickel metal.The conductivity of particles has a great influence on the growth of secondary dendrites.The higher the conductivity of particles deposited on the cathode surface,the smaller the local current density on the cathode surface,which reduces the growth of secondary dendrites and inhibits the growth of dendrites.In summary,this study reveals the particle transport law,flow field characteristics,electric field characteristics and the dynamics law of composite electrodeposition,which lays a foundation for the preparation of new electrolytic water catalytic materials by composite electrodeposition technology and the study of composite electrodeposition mechanism.