Synthesis of Au@Pt Core-Shell Nanoparticles with High Electro-catalytic Activity of Methanol Oxidation by Photochemical Seeding Growth

摘要

Au@Pt core-shell nanoparticles were synthesized by photochemical seeding growth method in PEG- acetone system, in which the thickness of Pt shell could be controlled by changing the molar ratio ofAu seed to Pt(IV). The morphology and size of synthesized nanoparticles were characterized by usingUV-Vis, TEM, HR-TEM and XPS. These also proved their core-shell structure. The electrochemicaltests indicated that the Au@Pt core-shell structure nanoparticles were active and stable in the reactionof methanol catalytic oxidation. When the molar ratio of Au to Pt was 1:1, the activity of compositenanoparticles was the highest, which was 304.8% higher than that of Pt/C. Electro-catalytic activity ofthe Au@Pt core-shell nanoparticles is little affected by temperature.