▎ 摘　　要

NOVELTY - A nitrogen-doped graphene-carbon nanotube cobaltosic oxide hybrid material is prepared by mixing graphite powder, sodium nitrate and concentrated sulfuric acid into flask, stirring in ice bath, adding potassium permanganate, putting flask into oil bath, heating and stirring, transferring mixture into deionized water, continuously stirring in oil bath, and naturally cooling to room temperature; adding deionized water and hydrogen peroxide into mixture, stirring, filtering and washing precipitate by diluted hydrochloric acid, drying to obtain graphite oxide, and taking graphite oxide in deionized water; and injecting carbon nanotube, ultrasonically processing, centrifugally removing bottom precipitate to obtain graphene oxide-carbon nanotube dispersion, taking graphene oxide-carbon nanotube dispersion, adding cobaltous acetate and ammonia water, ultrasonically treating, one-step hydrothermal reacting, washing black precipitate with deionized water, and oven drying. USE - Method for preparing nitrogen-doped graphene-carbon nanotube cobaltosic oxide hybrid material used for high efficiency oxygen reduction reaction catalyst (claimed). ADVANTAGE - The method can be used in large scale production, is simple and has mild conditions. DETAILED DESCRIPTION - A nitrogen-doped graphene-carbon nanotube cobaltosic oxide hybrid material is prepared by: (A) mixing 5-10 g graphite powder, 5-10 g sodium nitrate and 114-228 mL concentrated sulfuric acid into flask, stirring in ice bath for 10-20 minutes, adding 12-24 g potassium permanganate, putting flask into oil bath at 35 degrees C, heating and stirring for 60-90 minutes, transferring mixture into 230-460 mL deionized water, continuously stirring in 98 degrees C oil bath for 90-120 minutes, and naturally cooling to room temperature; (B) adding 360-720 mL deionized water and 40-80 mL of 30% hydrogen peroxide into mixture, stirring for 2-3 hours, filtering and washing precipitate by 5% diluted hydrochloric acid 3-5 times, drying to obtain graphite oxide, and taking graphite oxide in deionized water for 1-2 hours to obtain 1-4 mg/L graphene oxide dispersion; and (C) injecting carbon nanotube, ultrasonically processing for 1.5-2 hours, centrifugally removing bottom precipitate to obtain 1.5-6 mg/mL graphene oxide-carbon nanotube dispersion, taking 20-40 mL graphene oxide-carbon nanotube dispersion, adding cobaltous acetate and ammonia water, ultrasonically treating for 25-35 minutes to obtain mixed solution, one-step hydrothermal reacting to 50-100 mL hydrothermal kettle, washing black precipitate with deionized water 3-5 times, and oven drying at 60 degrees C for 9-12 hours.