▎ 摘　　要

A novel, two-step chemical reduction route is suggested to synthesize highly active and well-dispersed Pd3Sn alloy nanoparticles supported on chemically reduced graphene oxide (rGO) for the alcohol-tolerant oxygen reduction reaction. In this work, molecular-level dispersions of individuals are easily obtained, and graphene oxide is served as the stablization agent for Pd3Sn nanoparticles, and as carbon support which is co-deposited with metal or alloy particles. Transmission electron microscopy, Raman and powder X-ray diffraction results show that Pd and Pd3Sn nanoparticles are finely-dispersed on multi-layer rGO with well-controlled particle sizes, dispersities and composition uniformities. Electrochemical measurements confirm that Pd3Sn/rGO exhibites higher oxygen reduction activity and alcohol-tolerant ability than the Pd/rGO thanks to the smaller sizes of Pd3Sn nanoparticles and the strong interaction between metal and rGO. This new strategy provides a facile route to synthesize multicomponent alloy loaded rGO composites for use in electro-catalysis.