▎ 摘　　要

NOVELTY - A platinum-gold/graphene-tin oxide catalyst preparing method involves dissolving oxidized graphene in water dispersing, adjusting pH to 3-5, adding ethylenediamine, stirring, washing and filtering. The filter cake is added with water, ethanol solvent and sodium borohydride and refluxed to obtain modified graphene mixture. The graphene mixture is added with tin oxide and sealed to obtain graphene-tin oxide displacing solution, followed by depositing copper atomic monolayer on surface of platinum-gold alloy nanoparticles, immersing in the graphene-tin oxide displacing solution and irradiating. USE - Method for preparing platinum-gold/graphene-tin oxide catalyst for use in methanol fuel cell and formic acid fuel cell (claimed). ADVANTAGE - The method enables preparing platinum-gold/graphene-tin oxide catalyst with increased catalyst activity and increased stability. DETAILED DESCRIPTION - A platinum-gold/graphene-tin oxide catalyst preparing method involves taking platinum-gold alloy nanoparticles and ethylenediamine modified graphene, dissolving oxidized graphene in water and dispersing ultrasonically to obtain an oxidized graphene dispersion, adjusting pH of the oxidized graphene dispersion to 3-5, adding ethylenediamine, stirring, washing with deionized water at the end of the reaction and filtering to obtain filter cake. The filter cake is added with deionized water, ethanol solvent and sodium borohydride, and subjected for reflux reaction at 60-80 degrees C for 4-10 hours to obtain modified graphene mixture. The modified graphene mixture is added with tin oxide, dispersed ultrasonically and sealed after crystallization to obtain graphene-tin oxide displacing solution, followed by depositing copper atomic monolayer on the surface of platinum-gold alloy nanoparticles, immersing in the graphene-tin oxide displacing solution for 15-30 minutes and irradiating under UV lamp for 10-30 minutes.