▎ 摘　　要

NOVELTY - Preparation of membrane electrode catalyst involves (s1) connecting graphite foil with positive electrode, and platinum sheet with negative electrode, and oxidizing and intercalating in concentrated sulfuric acid and ammonium nitrate solution to obtain graphene oxide product, (s2) mixing graphene oxide product with urea and water, performing ultrasonic treatment to obtain suspension, transferring the suspension into reaction kettle, and performing high-temperature and high-pressure hydrothermal reduction reaction to obtain nitrogen modified reduced graphene oxide, (s3) mixing nitrogen-modified reduced graphene oxide and carbon black in the mass ratio of 2: 3, adding chloroplatinic acid, ethylene glycol and water to obtain suspension, ultrasonically dispersing and stirring, and performing hydrothermal reduction reaction in reaction kettle to obtain the platinum-nitrogen modified reduced graphene oxide/carbon black composite catalyst. USE - Preparation of membrane electrode catalyst for high-temperature proton exchange membrane fuel cell. ADVANTAGE - The method efficiently provides high temperature proton exchange membrane fuel cell membrane electrode catalyst. DETAILED DESCRIPTION - Preparation of membrane electrode catalyst involves (s1) connecting graphite foil with positive electrode, and platinum sheet with negative electrode, and oxidizing and intercalating in concentrated sulfuric acid and ammonium nitrate solution to obtain graphene oxide product, (s2) mixing graphene oxide product with urea in the mass ratio of 25: 1 and water, performing ultrasonic treatment to obtain suspension, transferring the suspension into reaction kettle, and performing high-temperature and high-pressure hydrothermal reduction reaction to obtain nitrogen modified reduced graphene oxide, (s3) mixing nitrogen-modified reduced graphene oxide and carbon black in the mass ratio of 2: 3, adding chloroplatinic acid, ethylene glycol and water to obtain suspension, ultrasonically dispersing and stirring, and performing hydrothermal reduction reaction in reaction kettle to obtain the platinum-nitrogen modified reduced graphene oxide/carbon black composite catalyst. The surface platinum loading is 60%. The platinum nanoparticles have particle size range of 2-11 nm, and average particle size is 4.88±1.79 nm. An INDEPENDENT CLAIM is included for membrane electrode of platinum-nitrogen-modified reduced graphene oxide/carbon black composite catalyst.