Synthesis Of Transitional Metal-based Materials And Investigation On Their Electrocatalytic Properties

Facing the current energy crisis and environmental problems,the development and research of new energy has become one of the most important issues.The use of electrolysis technology to produce hydrogen energy,oxidation to produce organic substances commonly used in the industry,and degradation of pollutants are green feasible ways to reduce environmental pollution and save petroleum energy.Commonly used electrolytic catalysts include platinum carbon,ruthenium oxide,yttrium oxide and other precious metal elements and oxides.However,due to the small amount of precious metal elements stored in the earth and the high price,the industrial development of electrolytic technology is restricted.Through long-term exploration and research,it was found that transition metal elements such as Fe,Co,Ni,Cu,Mn,Mo,Cr,etc.are all expected to replace precious metals as high-efficiency electrocatalyst element materials.Among many materials,transition metal carbides,nitrogen Alloys composed of compounds,sulfides,hydroxides and various transition metal elements all exert excellent catalytic performance in various catalytic fields.In this paper,the application of the transition metal hydroxide Ni（OH）2 to degrade urea and the high-entropy alloy Fe Co Ni Mn Mo in the electrocatalytic oxygen production is studied to achieve the intention of reducing energy consumption and high selective catalysis of target molecules.The specific contents are as follows:（1）Selection of nickel nitrate hexahydrate and six methyl tetramine as raw materials,carbon cloth as the base,through the hydrothermal method was successfully grown in nickel hydroxide nanometer patches on the carbon cloth,performance tests show that Ni（OH）₂-NSs/CC overpotential of urea have lower oxidation and good catalytic stability,under the current density of 10 m A cm^-2 only 1.32 V vs.RHE voltage,and can keep the good stability for 24 h.At the same time,on this basis,acid and base neutralization can be used to build an acid and base asymmetric electrolytic cell,so as to realize the double-function electrolytic cell of acid hydrogen production and alkaline urea oxidation,which can not only prepare green energy hydrogen but also greatly reduce energy consumption,and only 0.66 V vs.RHE voltage can drive the electrochemical reaction of anode and cathode.（2）Dissolve ferric nitrate,cobalt nitrate,nickel nitrate,manganese dichloride,and ammonium molybdate in dimethylformamide using relatively simple electrospinning technology under experimental conditions,add polyacrylonitrile and polyvinylpyrrolidone,in High-entropy alloys supported on carbon nanofibers were prepared under appropriate experimental conditions to explore the interaction between high-entropy alloy element combinations and their application in electrocatalysis.Exploratory studies have found that different element combinations have a critical effect on the morphology of the materials,and had different degrees of response to the oxygen evolution reaction,with different catalytic effects.Among them,Fe Co Ni Mn Mo quinary alloy（Quinary HEA）shows relatively excellent catalytic performance.Only a270 m V overpotential is required to achieve a current density of 10 m A cm^-2 and stable operation for more than 40 h;changes in the combination of element types have different catalytic properties for the oxygen evolution reaction.It provides further support for the exploration of high-entropy alloys in the field of electrocatalysis.