Fabrication Of Platinum-based Composite Catalysts On Graphene And Their Electrocatalytic On Oxygen Reduction

Energy shortage restricts the world development and progress,Governments spend a lot of money and the scientific research personnel try to explore the environmental friendly energy research and develop the establishment of energy-intensive industries for the future of energy shortage and reduce the waste of resources. Carrier prepared by freeze-drying method, this paper explores the influence of drying methods on the catalytic performance.In this paper, using Hummers of graphite oxide prepared by the first, and then respectively using thermal expansion graphite oxide and freeze drying oxygen graphite for the control experiment, Respectively load platinum, nickel, iron, and explore different reduction method and microwave time, using Raman scattering spectrum, The infrared absorption spectrum, scanning electron microscope, The X-ray diffraction, Transmission electron microscopy, Cyclic voltammetry, Time current curve, Linear sweep method was tested for catalyst.Conclusion: after freeze drying of graphite oxide of great disorder, as a carrier is better.Hydrazine hydrate and microwave glycol are more thoroughly for some of graphite oxide reduction. Due to the toxic of hydrazine hydrate, I have this reduction method for another use. After vector was modified by Phosphaphenanthrene,Introduction of N atoms can well with Pt covalent bond in platinum reduction,Stop their reunion and a finer particle size of catalyst is obtained,The reduction performance is better than others catalysts.Use of freeze drying of graphite oxide as a carrier of load platinum,Microwave preparation method with ethylene glycol for catalyst reduction,Performance and stability of catalyst were better than commercial catalyst, home-made catalyst almost can replace commercial catalysts,Platinum can be a good load on grapheme and Platinum have uniform distribution and perfect morphology test by SEM and TEM, The particle size of statistics find the average particle size of sample is 3.9 nm.The Pt Ni/graphene catalyst(Pt:Ni=3:1) was maded by Microwave preparation method with ethylene glycol. Microwave time can influence the performance of the nickel-Platinum alloy catalyst,Compare with the electrochemical active surface area of the catalyst preparation and Half-wave potential of the catalyst by different time, time4,microwave time for 30 s-(60 s)- 30 s-(25) s to 60 s, Half wave potential and electrochemical activity area the biggest of all,We can choose the time for the best reaction time.Try to get core-shell structure platinum-nickel by direct load method and explore to adopt step reduction method and Phosphaphenanthrene modified method, even though I try to load iron on the CX-72, get the microwave time 4 min and solvent ratio 1:2 is suitable forthis reaction.,which is best for catalytic performance of catalyst.