▎ 摘　　要

NOVELTY - Preparing a graphene/alumina/titanium dioxide hetero junction material comprising (i) dissolving polyvinylpyrrolidone (PVP) in absolute ethanol and stirring magnetically at room temperature for 20-28 hours to obtain a uniform and transparent solution with a mass fraction of 10-20 wt.%, adding the ceramic material source, solvent and auxiliary agent to the above solution in sequence, where the volume ratio of PVP ethanol solution, solvent and auxiliary agent is (3-6):5:3, where the material source of the ceramic material is isopropyl titanate and 10-50 wt.% aluminum acetylacetonate and the volume ratio of isopropyl titanate and ethanol is (2-5): 9, stirring at room temperature to obtain a uniform spinning solution, (b) using an electrostatic spinning device the spinning solution is made into nano fibers and heating in a muffle furnace at 600 degrees C for 290 minutes with the heating rate of 2.0 degrees C/minutes to obtain ceramic nanofibers. USE - The hetero junction material is useful in preparing photo-electron energy conversion product and traditional three-electrode system as light anode (all claimed). ADVANTAGE - The method: is environmentally friendly; consumes less time; does not relate to complex chemical control and does not introduce surfactant; and the obtained product has controllable morphology and optimized properties. DETAILED DESCRIPTION - Preparing a graphene/alumina/titanium dioxide hetero junction material comprising (i) dissolving polyvinylpyrrolidone (PVP) in absolute ethanol and stirring magnetically at room temperature for 20-28 hours to obtain a uniform and transparent solution with a mass fraction of 10-20 wt.%, adding the ceramic material source, solvent and auxiliary agent to the above solution in sequence, where the volume ratio of PVP ethanol solution, solvent and auxiliary agent is (3-6):5:3, where the material source of the ceramic material is isopropyl titanate and 10-50 wt.% aluminum acetylacetonate and the volume ratio of isopropyl titanate and ethanol is (2-5): 9, stirring at room temperature to obtain a uniform spinning solution, (b) using an electrostatic spinning device the spinning solution is made into nano fibers and heating in a muffle furnace at 600 degrees C for 290 minutes with the heating rate of 2.0 degrees C/minutes to obtain ceramic nanofibers, (c) mixing and grinding graphite powder with a mass ratio of 10:1-30:1 with sodium chloride and then washing with water, adding 98 wt.% concentrated sulfuric acid and stirring magnetically for 20-25 hours, under ice bath conditions, adding potassium permanganate to the above solution at a mass fraction of 20-30 wt.% and controlling the temperature not to exceed 20 degrees C, subsequently, raising the temperature to 35-45 degrees C and keeping it for 20-40 minutes, and finally raising the temperature to 85-95 degrees C and keeping it for 30-60 minutes, adding 18.2 M Omega ultrapure water to diluting the sulfuric acid concentration to 30-40 vol.% and finally heating up to 100-110 degrees C for 15-35 minutes, adding distilled water and 30 vol.% hydrogen peroxide into the solution according to the volume ratio of (12-16):1, adding the 60-70 vol.% distilled water and 3-5 vol.% hydrogen peroxide, pickling the product obtained in the previous step with 5 wt.% hydrochloric acid solution and dialyzing in distilled water to obtain graphene oxide, and (iv) mixing graphene oxide with 1-15 wt.% ceramic nanofibers and dispersing in 18.2 M Omega ultrapure water ultrasonically, where the volume ratio of graphene oxide and ultrapure water is (1-37): 1000, carrying out hydrothermal reaction at 180 degrees C for 8 hours. An INDEPENDENT CLAIM is also included for graphene/alumina/titanium dioxide heterojunction material is prepared by the above mentioned method.