Preparation And Electrocatalytic Oxygen Evolution Of Nickel-iron Based Nanomaterials

Fossil energy is the main source of energy to sustain human activities,but the non-renewability of fossil energy and the pollution of the environment have forced us to look for new sources of energy.Hydrogen,with the advantages of high energy density,non-pollution and sustainability,is considered as one of the ideal energy sources to replace fossil fuels,and it can be obtained in an environmentally friendly way by electrolysis of water technology,thus attracting a lot of attention.However,the oxygen precipitation reaction（OER）in the process of hydrogen production from electrolytic water is limited by the slow kinetics of 4 electrons,so catalysts with high catalytic performance,high stability and low price need to be developed to facilitate this process.Current efficient catalysts for hydrogen production mainly consist of noble metals and their compounds（Ir,Ru,Ir O₂,Ru O₂）,but their expensive prices and scarcity limit their application in commercial hydrogen production.The abundant reserves,low prices and stable chemical properties of transition metals,their unique d-orbital electronic structures and the formation of coordination sites between them and nonmetallic elements with good OER catalytic activity make them highly promising OER catalysts.Based on the above,in this paper,a series of Fe-based and Ni-based catalysts were fabricated based on Fe and Ni,which are abundant in the Earth’s reserves,to further enhance the OER catalytic activity of the catalysts by reduction and coordination methods.（1）High-performance semi-reactive（oxygen precipitation reaction（OER））catalytic electrodes（Ni-Fe-phy@NF）,which are critical in new energy conversion and storage systems,were fabricated by ultra-fast in situ fabrication with treated three-dimensional nickel foam as the substrate.)Based on the robust complexation ability of phytate ions,bimetallic Ni-Fe phytates were rapidly grown in situ on the surface of nickel foam（Ni-Fe-phy@NF）.The electrochemical OER performance tests such as linear scanning voltammetry（LSV）,cyclic voltammetry（CV）,electronic impedance spectroscopy（EIS）and stability,and various physical characterization tools such as X-ray diffraction spectroscopy（XRD）,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）were used for in-depth analysis of the sample structure,elemental valence and morphology The results show that the Ni-Fe-phy@is the most important element in the world.The results showed that Ni-Fe-phy@NF exhibited good OER catalytic activity with an overpotential of 233 m V at a current density of 10 m A cm^-2 and was maintained at a current of 100 m A cm^-2 for 175 h with no significant change in current density.（2）The composite compounds of Fe and Ni bimetallic nanoparticle metal oxides,A-Fe-Ni-2-MI@CNTs,were fabricated by a simple reduction method,and the electrochemical OER performance of A-Fe-Ni-2-MI@CNTs was tested by linear scanning voltammetry（LSV）,cyclic voltammetry（CV）,electronic impedance spectroscopy（EIS）,and X-ray diffraction spectroscopy（XRD）physical characterization was performed to analyze the sample structure.The results showed that the A-Fe-Ni-2-MI@CNTs have a low overpotential of 259 m V at a current density of 10 m A cm^-2,showing good catalytic activity of OER.