▎ 摘　　要

NOVELTY - Preparing ferrous oxide (Fe3O4)/graphene composite material comprises providing Fe3O4 nano-particles and porous graphene frame including two parts, where the size of the spherical or near-spherical Fe3O4 particles uniformly to load the three-dimensional skeleton are connected with each other to form the porous graphene, structure is stable, and which is not easy to collapse, where the three-dimensional porous graphene-based composite material is prepared by e.g. dissolving ferric nitrate nonahydrate, and polyvinylpyrrolidone in de-ionized water to prepare mixed solution, and ultrasonically stirring, placing the mixed solution in the blast drying box and keeping the temperature until completely drying, and then grinding into powde, and transferring the grinded powder to the crucible, then placing crucible in tubular furnace, heating under oxygen/argon mixed gas, and maintaining the temperature, cooling the tubular furnace to room temperature, and collecting black foam-type product. USE - The method is useful for preparing ferrous oxide/graphene composite material. ADVANTAGE - The method: is simple to process, environmentally-friendly, and economical; has short production cycle, strong repeatability and large-scale preparation; and is suitable in the fields of energy storage and absorbing. DETAILED DESCRIPTION - Preparing ferrous oxide (Fe3O4)/graphene composite material comprises providing Fe3O4 nano-particles and porous graphene frame including two parts, where the size of the spherical or near-spherical Fe3O4 particles uniformly at 10-80 nm to load the three-dimensional skeleton are connected with each other to form the porous graphene, structure is stable, and which is not easy to collapse, where the three-dimensional porous graphene-based composite material is prepared by (a) dissolving ferric nitrate nonahydrate, and polyvinylpyrrolidone in de-ionized water to prepare mixed solution, and ultrasonically stirring for 5 minutes; (b) placing the mixed solution in 90 degrees C in the blast drying box and keeping the temperature until completely drying, and then grinding into powder; and (c) transferring the grinded powder to the crucible, then placing the crucible in tubular furnace, heating at the heating speed of 5 degrees C/minute under oxygen/argon mixed gas, and maintaining the temperature, cooling the tubular furnace to room temperature, and collecting the black foam-type product.