Synthesis,Structure Characterization And Performance Of Multi-component Nano Alloy In Fuel Cell

The noble metal nanomaterials of Pt-based and Pd-based have excellent optical,electrical and catalytic properties,so it has a wide application prospect in the above fields.However,due to the high price of the noble metal palladium platinum,and the stability of the noble metal is not good,so it is doped with non noble metals to form alloy catalyst many researchers are interested in the catalysts,and the nano alloy catalysts are related to the composition elements,composition,morphology and size of the alloy catalysts.Therefore,a lot of relevant research needs to be done on the nano alloy catalysts.In order to synthesize Pt based nano alloys with uniform morphology and good electrocatalytic properties,many kinds of Pt based nano alloys were prepared by solvothermal method,and their morphology,structure and composition were characterized by related instruments.Pd Cu Pt nanoalloy catalysts were successfully prepared by high-pressure reaction at 180?for 24 hours with acetylacetone platinum,acetylacetone palladium,acetylacetone copper as metal metal precursor,trisodium citrate dihydrate as reducing agent and decanyl trimethylammonium bromide as surfactant.It is concluded that it is icosahedral structure,different morphologies or sizes nanoalloys can be obtained when changing the reaction time or the input ratio of the metal precursor.The electrocatalytic nitrogen reduction was tested under acidic conditions,Pd_50.2Cu_38.4Pt_11.4-24 h the average ammonia production rate of the nanocrystalline alloy catalyst was 27.76?g·h^-1mg^-1_cat.,and the alcohol oxidation reaction at room temperature and high temperature was carried out under alkaline conditions,respectively.The commercial Pd black and Pt black were used as the to compare the mass activity of the icosahedron Pd_50.2Cu_38.4Pt_11.4-24 h nanoalloy catalyst under the test conditions of high temperature propanol were 2.48/1.76 times Pd black and Pt black,4.73/1.61 times at room temperature,2.05/1.72 times at high temperature ethylene glycol and 4.25/1.93 times at room temperature ethylene glycol.Using acetylacetone platinum,acetylacetone copper,acetylacetone cobalt as metal precursor,ascorbic acid as reducing agent,decalkyltrimethylammonium bromide as surfactant,N,N-dimethylformamide?DMF?as solvent,formaldehyde small molecule and silicomolybdic acid solution can be used to adjust the morphology of nano-alloy.at 160?,the Pt Cu Co nano-alloy catalyst was successfully prepared and characterized by transmission electron microscopy?TEM?,X-ray diffraction structure analysis?XRD?.In addition,by replacing the ratio of the metal precursor,we can obtain different morphologies or sizes nanoalloys,and the electrocatalytic methanol oxidation were tested under acidic conditions,compared with commercial standards,Pt Cu M nanocrystals showed better activity than Pt black.