▎ 摘　　要

NOVELTY - A graphene-supported platinum-cobalt-tungsten alloy nanoparticle composite catalyst comprises solid powder and platinum cobalt tungsten alloy nanoparticles, where the platinum cobalt tungsten alloy nanoparticles having a particle diameter of 2-5 nm, and uniformly dispersed on the surface of the graphene carrier. USE - Graphene-supported platinum-cobalt-tungsten alloy nanoparticle composite catalyst for acidic medium. ADVANTAGE - The graphene-supported platinum-cobalt-tungsten alloy nanoparticle composite catalyst has strong operability, and can be prepared in simple and easy manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a graphene-supported platinum-cobalt-tungsten alloy nanoparticle composite catalyst, which involves using ethylene glycol as a solvent and reducing agent, under heating conditions, achieving and precipitating co-reduction of the metals on the graphene support to obtain the finished product.