Preparation And Application Of Metal-based Ternary Composites In The Field Of Hydrogen Evolution Reaction

As the fossil fuels increasingly dried up and the increasingly serious environmental pollution along with the development of the industry,developing clean energy is around the corner,and much attention has been paid to the hydrogen as the most ideal clean new energy.Although producing hydrogen by the electrolysis of water is one of the most feasible solution in the production of hydrogen.As is known to all,platinum is one of the most effective catalyst for HER.But the high price and resource scarcity of platinum limits its large-scale application in a very great degree.Therefore,the development of low cost and high efficiency catalysts that have rich sources is particularly urgent.Composite nano-materials including transition metals and their compounds had been widely paid attention to because of their good electric catalytic activity performance during hydrogen evolution.Compared with precious metals,transition metals possess the advantages of rich sources and low price,thus have great application prospect in terms of industrialization.This paper studies two kinds of transition metals and their compounds of ternary composites applied in the field of electric catalytic activity of hydrogen evolution.The concrete research content is as follows:1.With nitrate hexahydrate nickel,chromium chloride hexahydrate,PVP,alcohol and DMF mixture as precursor solution,we used electrospinning method combined with heat treatment to preparate chrome oxide,nickel oxide double doped nickel nanofibers as hydrogen production catalysts.We also researched the electrocatalytic performance of other metal doped and undoped nickel nanofibers.Using X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and specific surface area analyzer methods characterized composition,structure and morphology of this kind of nanofibers.Using linear sweep method and voltage time figure tested the hydrogen evolution catalytic activity performance of the catalysts.Research results show that the chrome oxide,nickel oxide dual doped nickel nanofibers have good catalytic activity and stability,and can achieve current density of 100 mA cm-2 at the overpotential of 228 mV relative to the standard hydrogen electrode and the stability of the catalyst can last at least 120 hours.2.Calcining Ammonium molybdate as raw material can get molybdenum oxide,then mixing with sulfur powder in the reductive atmosphere,after further calcining achieve molybdenum,molybdenum dioxide double doped molybdenum disulfide powder.Finally loaded on the nickel foam and carbon cloth respectively,used for electric catalytic hydrogen production.Using X-ray diffraction(XRD),scanning electron microscopy(SEM)and other methods characterized the composition,structure and morphology of this kind of nanoplates.Using linear sweep voltammetry and chronoamperometry tested the performance of electric catalytic activity of hydrogen evolution of the catalyst in acidic and alkaline electrolyte.Results show that the new catalyst has excellent electrical performance for catalytic activity of hydrogen evolution.In the alkaline solution,it can achieve current density of 100 mA cm-2 at the overpotential of 370 mV relative to the standard hydrogen electrode and the stability of the catalyst can last at least 28 hours.In acid solution,it can achieve current density of 100 mA cm-2 at the overpotential of 500 mV relative to the standard hydrogen electrode and the stability of the catalyst also can last at least 28 hours.