Preparation Of Ni/NiFe-LDH Core-shell Schottky Heterojunction And Its High Current Water Electrolysis

Hydrogen（H₂）is regarded as an important new clean energy because of its high energy density,wide sources,and without carbon dioxide after combustion.Due to the double carbon emission reduction background,it has a very important energy value and strategic significance.In addition,only green hydrogen（hydrogen production by electrolytic water splitting）can be considered as a true zero-carbon energy source,but it is very high that the cost of producing green hydrogen by using the current power grid.Therefore,the implementation of renewable energy to produce green hydrogen is the end goal of the future zero-carbon society and the key to the future development of hydrogen production by electrolysis of water.Nowadays,the best performing precious metal catalysts have been severely limited due to the high price and scarcity.Although researchers have reported a wide variety of non-precious metal water electrolytic catalysts,their ability to meet practical production requirements and use with renewable energy sources is still rare.In order to improve the catalytic activity of the electrolytic water catalyst,we will combine the better materials of the two half reactions.In terms of stability,we will construct the special electronic structure of Schottky junction.In application,we will use the methods that can be prepared quickly and on a large scale.Finally,the electrolytic water catalyst,Ni/Ni Fe-LDH/IF,was introduced.1.On the basis of the results of orthogonal experiment to find out the best OER performance of the Ni Fe-LDH,a layer of pure metal Ni was wrapped by magnetron sputtering to form a Schottky junction catalyst with a core-shell structure.2.At the current density of 10,100,500 and 1000 m A cm^-2,the overpotential of hydrogen evolution can reach 56,177,257 and 277 m V,and the overpotential of oxygen evolution can reach 140,244,303 and 330 m V,respectively.The potential of water splitting was 1.486,1.689,1.836 and 1.867 V,respectively.In terms of stability,it has reached the excellent stability performance of 1500 hours stability at 1000 m A cm^-2,250 hours stability under industrial conditions and keep the LSV stability before and after 3000 cycles CV.3.In the practical application of combined with solar power panel,the electrolytic cell can produce hydrogen steadily for 30 days continuously,which produces about1500 m L of hydrogen every day.In addition,a large area catalyst with the size of 10×10cm was prepared.In addition,Ni/Ni Fe-LDH/IF catalyst also has great potential in seawater desalination.4.In the Schottky junction model analysis and density functional theory,it is known that the special electronic structure of the Schottky junction of Ni/Ni Fe-LDH can accelerate the electron transfer of HER reaction and enhance the adsorption of the reactant OH^-in OER reaction,which can promote the electrolytic water reaction.