▎ 摘　　要

NOVELTY - Graphene loaded composite catalyst comprises platinum-praseodymium/praseodymium oxide nanoparticle with the particle size of 2-10 nm, and uniformly dispersed on the surface of graphene carrier. The mass ratio of platinum-praseodymium/praseodymium oxide nanoparticles to graphene is between 1:10-1:1. The atomic ratio of the platinum-praseodymium is 1:1-4:1. USE - The graphene loaded composite catalyst is used as catalyst in the oxygen reduction reaction of acidic medium (claimed). ADVANTAGE - The catalyst has high electrocatalytic activity and stability for oxygen reduction reaction in acidic medium, and the performance is superior to that of commercial platinum-praseodymium/carbon catalyst. The method is simple and easy one-step method and annealing treatment method, polyol as solvent and reducing agent, mixing the graphene and two metal precursor salt, under the condition of heating, realizing co-reduction of two metals and depositing on the graphene carrier. DETAILED DESCRIPTION - AN INDEPENDENT CLAIM is also included for a method for preparing the graphene loaded composite catalyst.