▎ 摘　　要

NOVELTY - Three-dimensional graphite alkenyl composite electrode of gold nanogranule surface coated with manganese oxide, is prepared by using three-dimensional porous nickel foam as substrate, directly growing substrate on graphene, then directly growing the graphene on flower shaped manganese oxide ( delta -MnO2), and loading gold nanogranules in the flower shaped manganese oxide. USE - The three-dimensional graphite alkenyl composite electrode of gold nanogranule surface coated with manganese oxide is used in lithium-air battery and air electrode (all claimed). ADVANTAGE - The three-dimensional graphite alkenyl composite electrode of gold nanogranule surface coated with manganese oxide can be prepared simply and cost-effectively within short period of time, does not contain any conductive agent and binder, and has good stability. The method consumes less energy and hence suitable for large-scale industrial production of the electrode. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing three-dimensional graphite alkenyl composite electrode of gold nanogranule surface coated with manganese oxide, which involves (a) obtaining three-dimensional porous nickel foam as substrate, directly growing substrate on graphene by chemical vapor deposition, and obtaining product denoted as nickel/3D-graphene (Ni/3D-G), (b) dissolving the potassium permanganate and sulfuric acid in deionized water, uniformly stirring the mixture to obtain mixed solution, immersing the nickel/3D-graphene obtained in the step (a) in mixed solution, performing hydrothermal reaction at 70-120 degrees C for 1-5 hours, and washing and drying the nickel/3D-graphene loaded with manganese hydroxide, where the concentration of the potassium ion in the mixed solution is 0.005-0.02 mol/l, and the molar ratio of sulfuric acid and potassium permanganate is 0.25-1, (c) calcining the nickel/3D-graphene loaded with manganese hydroxide at 200-500 degrees C for 1-4 hours under argon atmosphere, and cooling the obtained nickel/3D-graphene/( delta )-manganese oxide, and (d) mixing gold-containing soluble compound with water to obtain solution having gold at a concentration of 1-10 mmol/l, immersing the nickel/3D-graphene/( delta )-manganese oxide in the obtained solution for 10-24 hours, and then washing and drying the obtained product.