▎ 摘　　要

Bimetallic alloyed Pd-Au nanochain networks supported on reduced graphene oxide (Pd-Au NNs/RGO) were prepared by a one-pot wet-chemical co-reduction method with the assistance of caffeine as a capping agent and a structure directing agent, while no seed, template, or surfactant was involved. It was found that the dosage of caffeine and the concentrations of the precursors (i.e. PdCl42- + AuCl4-) played essential roles in the formation of Pd-Au NNs. Moreover, the as-prepared nanocomposites exhibited much better electrocatalytic performance than those of conventional Pd black and Pd-C toward oxygen reduction reaction (ORR) in alkaline media in terms of the onset potential, limiting current, and stability.