▎ 摘　　要

Pd nanoparticles (PdNPs) supported on reduced graphene oxide (RGO) nanomaterials have been prepared by a one-step synthesis strategy through solid-state reactions. The process to produce Pd/RGO nanocomposites is environment-friendly and accomplished by simply grinding palladium acetate, graphene oxide and ascorbic acid (AA) for about 1 hour. No solvents and organic protectors are needed throughout the procedure. The composition, morphology, formation mechanism and the electro-catalytic performance of the Pd/RGO were investigated. It was found that AA can reduce Pd2+ ion and GO to Pd-0 and RGO, and Pd nanoparticles were loaded on RGO to form Pd/RGO nanomaterials subsequently. A two-step reaction mechanism was also put forward to further understand the formation of the Pd/RGO. Electrochemical tests indicate that the Pd/RGO nanocomposites show better electrocatalytic performance than PdNPs for the electro-oxidation of methanol and ethanol, which holds great promise for practical application in direct alcohol fuel cells. (C) 2017 The Electrochemical Society. All rights reserved.