▎ 摘　　要

NOVELTY - Preparing graphene-supported cobalt-based bimetallic single-atom electrocatalyst comprises ultrasonically exfoliating graphite oxide to obtain a defective graphene oxide GO dispersion, adding the cobalt metal and M metal salt solution into the defective graphene oxide GO dispersion, ultrasonically dispersing, adding urea, and ultrasonically treating to form a uniform mixture, and freeze-drying to obtain Co/M/Urea/GO precursor, adding the obtained precursor into a quartz boat, and treating at 400-600℃ for 1 hour at a heating rate of 2-5℃/minute under nitrogen atmosphere, raising the temperature to 750-850℃ for 2 hours, cooling to room temperature to obtain a black powder, washing with acid and drying. The M metal comprises vanadium, chromium, manganese, iron, nickel, copper and molybdenum. USE - The preparation of graphene-supported cobalt-based bimetallic single-atom electrocatalys is useful in hydrogen evolution reaction and oxygen reduction reaction (claimed). ADVANTAGE - The electro-catalyst has excellent catalytic performance.