Study Of Preparation And Performance Of Composite Metal Foam Coating As HER Catalyst

In this dissertation,the technology of composite electrodeposited MoS₂/ZrO₂（molybdenum disulfide/zirconium dioxide）were adopted to prepare the foamed copper coating（MoS₂/ZrO₂）-Ni as hydrogen evolution reaction（HER）catalyst.Then,the catalyst’s morphological characteristics were observed,and the impact of composite electrodeposited MoS₂/ZrO₂on the catalyst’s morphology and structure and on the HER performance in alkaline electrolytic solution was studied.Lastly,the mechanism of the composite MoS₂/ZrO₂ electrodeposition process was explored.The details of the research are as follows:The orthogonal experimental design was conducted to characterize the morphology and composition of the foamed copper coating（MoS₂/ZrO₂）-Ni as HER catalyst prepared by composite MoS₂/ZrO₂ electrodeposition.The test results show that the main influencing factors in the composite MoS₂/ZrO₂ electrodeposition technology,including electrodeposition voltage,electrodeposition time,effective concentration ranges of MoS₂ and ZrO₂.Meanwhile,the impacts of these influencing factors on the morphology and composition of the HER catalyst were analyzed.Consequently,three effective processes A₁B₂C₂D₂,A₃B₁C₃D₂ and A₂B₂C₃D₁for preparing the foamed copper coating（MoS₂/ZrO₂）-Ni as HER catalyst,with relatively uniform morphology and phase structure,were determined.The effects of electrodeposition voltage,electrodeposition time,MoS₂ and ZrO₂concentration process parameters on the hydrogen precipitation performance of the foamed copper metal-based（MoS₂/ZrO₂）-Ni hydrogen precipitation catalytic materials in alkaline electrolytic water environment were analyzed by electrochemical methods such as testing the polarization overpotential of the kinetic potential polarization curve and Tafel slope,combined with MoS₂/ZrO₂ two-particle electrodeposition for the preparation of foamed copper metal-based（MoS₂/ZrO₂）-Ni hydrogen precipitation catalysts were prepared by MoS₂/ZrO₂ two-particle electrodeposition,and the optimal process was determined.The process parameters were 9V electrodeposition voltage,5min electrodeposition time,15g/L MoS₂ particles,10g/L ZrO₂ particles.The experimental results of the polarization overpotential and Tafel slope of the dynamic potential polarization curves showed that the optimal MoS₂/ZrO₂ two-particle electrodeposition process produced the foamed copper metal-based（MoS₂/ZrO₂）-Ni hydrogen precipitation catalysts better than the foamed copper metal-based MoS₂-Ni hydrogen precipitation catalysts and the foamed copper metal-based ZrO₂-Ni hydrogen precipitation catalysts prepared by the MoS₂ or ZrO₂ particle electrodeposition process.Ni hydrogen precipitation catalysts.It was shown that the foamed copper metal-based（MoS₂/ZrO₂）-Ni materials prepared by the optimal process had the largest electrochemical activation area（167.39 m²/g）,which is an important reason for their better performance in alkaline electrolytic hydrogen precipitation.The electrochemical noise（EN）shows that MoS₂ and ZrO₂ particles are beneficial to the nucleation of electrodeposited Ni coating on the foamed copper substrate.The electrodeposited（MoS₂/ZrO₂）-Ni copper foam was characterized by both diffusion-control and electrochemical control.The interaction of microparticles MoS ₂ and ZrO₂particles increases the nucleation difficulty of Ni during the electrodeposition of（MoS₂/ZrO₂）-Ni copper foam.The results of the electrodeposition study in a finite electrolytic cell flow field environment show that the limited electrolytic cell volume restriction leads to a weaker diffusion process in the electrodeposition of the foamed copper metal-based（MoS₂/ZrO₂）-Ni materials and cannot improve the nucleation process in the electrodeposition of the foamed copper metal-based（MoS₂/ZrO₂）-Ni materials.