▎ 摘　　要

NOVELTY - Graphene-loaded cobalt-nitrogen-carbon supramolecular hybrid aerogels composite material having three-dimensional porous network-like structure, comprises graphene and cobalt-nitrogen-carbon active catalysis center, which is formed by non-covalent assembly of pyridine-tryptophan gel factor, cobalt ion and graphene substrate. USE - Graphene-loaded cobalt-nitrogen-carbon supramolecular hybrid aerogels composite material is used in the field of oxygen reduction catalyst (claimed). ADVANTAGE - The graphene-loaded cobalt-nitrogen-carbon supramolecular hybrid aerogels composite material has catalytic action of the oxygen reduction reaction effect, good stability, good electrical performance, good methanol toxicity, the current density can reach 4 milliamperes per square centimeter, oxygen reduction starting potential is about -0.07Volt, the peak voltage is approximately -0.175Volt, the catalytic effect can be compared with the commercial platinum carbon, and can be prepared in a simple and cost-saving manner. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) method for preparing graphene-loaded cobalt-nitrogen-carbon supramolecular hybrid aerogels composite material, which involves dissolving the pyridine tryptophan gel factor in ultra-pure water, ultrasonically dispersing to obtain reserve mother liquor; dissolving the soluble cobalt salt in ultra pure water, ultrasonically dispersing to obtain the cobalt ion solution, taking the graphene oxide aqueous solution, adding phosphate buffer solution into the graphene oxide water solution; adjusting pH of oxidized graphene water solution to alkalescence, and phosphate mixed solution to obtain oxidized graphite alkene; adding the obtained cobalt ion solution into the obtained reserve mother liquor, shaking up, then adding it into the phosphate mixed solution of graphene oxide, shaking up, and ultrasonically dispersing to obtain supramolecular hydrogel, performing hydrothermal reaction, vacuum freeze drying and carbonization treatment to obtain the graphene load cobalt-nitrogen-carbon supramolecular hybrid aerogel composite material; and (2) method for preparing the graphene oxide solution, which involves utilizing graphite flake and potassium permanganate, concentrated sulfuric acid and phosphoric acid; uniformly mixing the mixed solution of concentrated sulfuric acid and phosphoric acid; slowly adding to the mixture of graphite flake and potassium permanganate, maintaing the temperature at 35-40 degrees C in the adding process, then at 45-55 degrees C, stirring and reacting for 11-13hours; after cooling the reaction system to room temperature and adding ice water of concentrated sulfuric acid and phosphoric acid mixed solution of the same volume; adding hydrogen peroxide to the reaction system is bright yellow, and then centrifuging for 15-18minutes at the speed of 4500-5500 rotations per minute, removing the supernate, purifying residue by using ultra-pure water; and washing with hydrochloric acid for 2-4 times to obtain the graphene oxide water solution.