Study On The Supporting And Oxygen Evolution Performance Of Hollow Carbon Fiber To Spinel Cobaltate

In recent years,spinel-type structured cobalt?such as NiCo₂O₄,CuCo₂O₄,etc.?due to its large crustal reserves,low cost,environmentally friendly,high electrochemical activity,rich oxidation valence,stable chemical properties,etc.The field of electrocatalysis has broad application prospects and certain research value.However,the spinel-type NiCo₂O₄,CuCo₂O₄ and other bimetallic transition metal oxides prepared by traditional methods still have some shortcomings when used as a catalyst for electrocatalytic anode oxygen evolution?OER?,such as the specific surface area due to the stacking between materials The shortcomings of small,low active sites and low conductivity of the material itself at room temperature have largely hindered the application and development of such bimetallic transition metal oxides on OER.In this paper,aiming at the shortcomings of the bimetallic transition metal oxide electrodes such as Ni Co₂O₄ and CuCo₂O₄ with spinel structure,the advantages of hollow carbon fiber large specific surface area,high electron transport capacity and electron conduction efficiency are used to combine the two.Solvothermal,heating oxidation and other means are used to adjust the morphology,thereby improving the performance of NiCo₂O₄ and CuCo₂O₄ bimetallic transition metal oxides at the anode reaction.The specific research contents are as follows:?1?Prepare the hollow carbon fiber-loaded CuCo₂O₄ composite nanomaterials by the preparation method of electrostatic spinning and high temperature calcination.At a current density of 10 mA cm^-2,the material showed an overpotential of 273 mV,and the continuous current for 10 h still retained a high residual value of current density,showing good cycle stability.The experimental results show that the synergistic effect of the hollow carbon fiber and the needle-like structure of CuCo₂O₄ increases the number of surface active sites on the specific surface area of the catalyst,provides a new electron electron transfer path,enhances the mass transfer efficiency and gas dissipation,and accelerates the reaction kinetics,Thereby improving the OER performance of CuCo₂O₄.?2?Through the OER electrochemical test,X-ray diffraction,scanning electron microscope and other technical means to analyze the performance of the prepared electrode and characterize the morphology.Compared with the synthesized NiCo₂O₄,NiCo₂O₄@C shows an over-potential of 336 mV and a higher current density residual value for 10 h of continuous reaction at a current density of 10 mA cm^-2,and a Tafle of89.6 mV dec^-11 The slope and the C_dll value of 88.5?F cm^-22 and the smaller impedance and the better retention of the catalytic capacity before and after the cyclic CV 3 000cycles.