Lyotropic Liquid Crystals Template Method Synthesis Of Nano-Alloy Of Pt-Au And Electrochemical Performance

Nanometer materials are one of the new materials mostly concerned for the last few years.It has become one of hot-spot study fields because of its high surface activity, special size effect,photoelectric effect and catalytic effect.Nano-particles have a wide application prospect in aspects of catalyst,electronic materials,micro devices,and reinforced material transducing equipments.In recent years,with the development of self-assembly nanotechnoloy,template method,which is a new method to symthesis of nanometer materials,has been paid more and more attention.This paper mainly included the following two aspects:(1)Lyotropic Liquid Crystals template method and electrodeposition are used for preparing Pt-Au nano-particles.By changing the concentrations of metal salts,non-ionic surfactant dosage(total mass w%) and deposition potential,effect of nanometer alloy is studied.The results show that The results show that preparing conditions:ratio of AuCl₃ and H₂PtCl₆ Moore concentration is 1.5:1.surfactant dosage is 50wt%.Nanoalloy of stable structure can be obtained under the constant potential of -0.14 V～-0.2 V and the deposition time of 1500 s.(2) CV curve of Pt-Au nano alloy was studied in 0.5 mol/L H₂SO₄ solution,and stability of nano alloy was good.In 0.5mol/L H₂SO₄ solution containing methanol,cyclic voltammetry was conducted on the Pt-Au nano alloy prepared at different conditions. Results showed that the oxidation peak current of methanol was enhanced with the increase of concentration of methanol.Compared with that of pure metal,the methanol oxidation current on the Pt-Au nano-alloy was much higher in the same solution.This indicated that Pt-Au nano-alloy possessed good catalytic properties for methanol oxidation.