▎ 摘　　要

NOVELTY - A graphene composite layer contains graphene, Prussian blue set on graphene upper layer, and platinum nanoparticles arranged on Prussian blue upper layer. USE - Graphene composite layer for modified electrode and methanol oxidation (all claimed). ADVANTAGE - The layer has excellent electronic properties, large active surface area, and high catalytic activity, is porous to facilitate uniform platinum nanoparticle deposition, enhances interaction with platinum and graphite, improves catalytic stability, and reduces toxicity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) modified electrode containing substrate electrode which is indium tin oxide (ITO) electrode and modified layer which is graphene composite layer; (2) preparation of modified electrode which involves coating graphene dispersion liquid on ITO substrate electrode, drying to obtain graphene-modified ITO electrode, placing obtained electrode in Prussian blue solution, carrying out 1st electrochemical deposition to obtain Prussian blue-graphene modified electrode, and carrying out 2nd electrochemical deposition using molybdenum chloride acid solution; and (3) application of graphene composite layer for methanol oxidation. DESCRIPTION OF DRAWING(S) - The drawing shows a scanning electron micrograph of the obtained modified electrode layer.