▎ 摘　　要

NOVELTY - Preparation of self-supporting nonmetal-doped graphene flexible film electrode, involves slowly adding 1-3 g crystalline flaky graphite to 40-60 mL concentrated sulfuric acid, stirring at normal temperature for 5-10 minutes, slowly adding 4-6 g strong oxidant, stirring for 1-2 hours, reacting to obtain a graphite oxide dispersion, centrifuging the dispersion, cleaning, drying to obtain a graphite oxide solid, dispersing the solid in deionized water, ultrasonically peeling for 1-3 hours to obtain 50-100 g/L graphene oxide suspension slurry, transferring the slurry to a heterogeneous substrate surface, scraping uniformly at 0.2-2 cm/second using a scraper to obtain a graphene oxide film/heterogeneous matrix composite, drying the composite, peeling, cutting to obtain a self-supporting graphene oxide film, and mixing the film with a doping source containing nonmetal heteroatoms in a mass ratio of 1:5-1:15. USE - Preparation of self-supporting nonmetal-doped graphene flexible film electrode useful as electrocatalyst in oxygen evolution reaction (claimed) in metal air batteries and water electrolysis device. ADVANTAGE - The method enables simple preparation of electrode using rich raw material source, on a large scale. The obtained electrode uses nonmetal-doped graphene nanosheet as conductive framework, with good flexibility, large specific surface area, and rich active sites, showing a wide application prospect in electrocatalysis.