Graphene carbon nano composite material as well as preparation method and application thereof

The invention discloses a graphene carbon nano composite material as well as a preparation method and application thereof. The preparation method of the graphene carbon nano composite material comprises the following preparation steps: S1, adding graphite oxide into a solvent, and dispersing to obtain a graphene oxide suspension; s2, sequentially adding a manganese sulfate solution and a potassium permanganate solution into the graphene oxide suspension according to the mass ratio of manganese dioxide to graphene oxide in the final product of 7: (2-4), stirring, filtering, collecting precipitate, and drying to obtain a manganese dioxide-graphene oxide compound; and S3, mixing the manganese dioxide-graphene oxide compound with acidized carbon nanotubes to prepare a suspension, carrying out ultrasonic dispersion, and then carrying out heat treatment and reduction treatment to obtain the graphene carbon nano composite material. The preparation method is simple, and the graphene carbon nano composite material obt