Interfacial Structure Of NiO/NiFe LDH Enhances Electro-catalytic Water Oxidation

Energy crisis and environmental pollution are two key problems to be solved urgently.Developing sustainable,pollution-free clean energy technology is the key to solve the problem.Among them,the development of clean energy regeneration technology,electrolytic water,metal air battery and dye battery are very promising technologies.At present,these technologies are mainly limited to the development of highly efficient and clean catalysts,especially the oxygen evolution reaction(OER)catalysts,which are very slow in reaction kinetics.Since scientists discovered that nickel iron layered double hydroxides(NiFe-LDH)can be used as cheap and efficient OER catalysts,scientists in various countries have devoted themselves to more efficient catalytic methods.In this paper,NiO/NiFe-LDH nanocomposite catalysts with close chemical bonding were synthesized on the basis of ultrathin NiFe-LDH nanosheets;Through the construction of three-dimensional space structure to realize the intermediate product of OER reaction active sites adsorption,greatly reduce the adsorption of intermediate product of each step is to break through the traditional single linear relationship between adsorption transition metal catalytic active sites can improve the catalytic activity of OER,NiFe-LDH of the great.1.In this paper,the composite catalysts of NiO and NiFe LDH in situ were successfully prepared by laser ablation of NiFe alloy target.The composite catalysts with different NiO content were obtained by controlling the concentration of the liquid phase.2.Compared with NiO/NiFe LDH composite catalyst,pure phase NiFe LDH catalyst and NiO nanoparticle catalyst,the performance of oxygen evolution showed that the composite catalyst exhibited excellent water oxidation performance.3.Through theoretical calculations show that the catalytic site of the most excellent,and Bader charge analysis of valence change optimal active sites in the catalytic process based on;based on this,there is no further exploration of high activity of Ni in the experiments,theoretical model and calculation accuracy of reaction of binding sites of double EELS analysis and validation of X-ray.4.This interface three spatial structure of multisite collaborative help adsorption oxygen evolution reaction intermediates,greatly reduce the adsorption of each step of reaction,adsorption and breakthrough of single transition metal catalytic activity of traditional adsorption four step reaction intermediates can be caused by the linear relationship between the linear relationship and the 0.37 V the theory of potential.It is the first time to break the linear relationship of OER reaction in the form of interface space structure,which has important guiding significance for the design and synthesis of more excellent catalysts in the future.