Preparation Of Three-dimensional Nickel-based Alloy Catalyst And Its Application In Hydrogen Production From Water Electrolysis

Since mankind entered the"Electrical Age",traditional energy sources such as coal,oil,and natural gas have been exploited in large quantities,and the problem of energy shortage has become increasingly serious with the development of society.Hydrogen energy has a wide range of sources,clean and efficient,and people are increasingly favoring it.How to use electrolysis to make full use of water resources to obtain hydrogen energy has gradually become the focus of research.The method of electrolyzing water to produce hydrogen is simple in principle,environmentally friendly,and clean in product.However,in practical applications,this method faces many difficulties such as low conversion rate and high cost.Looking for a high-efficiency and low-cost electrolysis water hydrogen production catalyst has become an urgent problem to be solved.At present,the precious metal Pt is the mainly commercial electrolysis water hydrogen production catalyst.Due to its high price and scarce reserves,it is difficult to be applied on a large scale in the market.Transition metals(such as Ni,Co,Cu)have low cost,abundant reserves,and it has a catalytic hydrogen evolution activity comparable to that of precious metals,which is conducive to the realization of large-scale industrial production.Therefore,in this paper,the preparation method of constant current deposition is used to study the preparation,performance and application of nickel-based alloy catalysts.The main research contents are as follows:(1)The NiCu/NF alloy catalyst was prepared by the constant current electrodeposition method,and the influence of copper sulfate concentration,ammonium sulfate concentration,current intensity and deposition time on the electrocatalytic hydrogen evolution performance of NiCu/NF alloy was explored.The results show that when the concentration of copper sulfate is 0.03 mol/L,the concentration of ammonium sulfate is 0.03 mol/L,the current intensity is 0.2824 A,and the deposition time is 7.5 min,the prepared alloy catalyst has the best catalytic hydrogen evolution activity and stability.When the current density is 10 mA/cm~2,the overpotential is-107 mV,and the catalytic process can be kept stable for 10 h.(2)NiCo/x alloy catalysts were obtained by constant-current deposition on the brass substrate,the foamed nickel substrate and the pine needle-like foamed nickel substrate.The composition of the plating solution,the deposition time,the deposition temperature,the pH value and the current density were investigated for the effect of NiCo/x The influence of the alloy’s electrocatalytic hydrogen evolution performance has resulted in the preparation process with the best electrocatalytic hydrogen evolution activity.The results show that the pine needle-shaped NiCo/NF electrode has excellent electrocatalytic hydrogen evolution activity and stability.When the current density is 10 mA/cm~2,the overpotential is-81 mV,and the catalytic activity of the electrode is stable within 10 h.(3)The in-depth analysis of the hydrogen energy industry,electrolysis of hydrogen technology and the market status of nickel-based catalysts shows that the application of nickel-based catalysts to alkaline electrolyzers to produce hydrogen and obtain hydrogen energy has huge market competitiveness and application potential.