▎ 摘　　要

NOVELTY - A porous graphite/manganese dioxide midline coaxial nanowire material comprises long and short graphene sheets having a length of 10-40 m and a diameter of 40-160 nm and manganese dioxide nanowires having a diameter of 30-80 nm. USE - Porous graphene/ manganese dioxide midline coaxial nanowire material for use as an electrochemical supercapacitor electrode active material (claimed). ADVANTAGE - The porous graphene/ manganese dioxide midline coaxial nanowire material has higher specific capacity and better cycle stability and excellent electrochemical performance at high current charge and discharge conditions, can be prepared with less energy consumption and total mass of graphene of 2.2% in a simple manner. DETAILED DESCRIPTION - A porous graphite/manganese dioxide midline coaxial nanowire material comprises long and short graphene sheets having a length of 10-40 m and a diameter of 40-160 nm and manganese dioxide nanowires having a diameter of 30-80 nm, where the porous graphite/manganese dioxide midline coaxial nanowire material is prepared by dissolving potassium permanganate powder in deionized water, adding ammonium fluoride and stirring at room temperature for 10-20 minutes, adding graphite association dispersion liquid to the resulting solution, stirring for 10-15 minutes, transferring resulting solution to a hydrothermal reaction autoclave, taking out the solution, cooling to room temperature, soaking the resulting reduction product in hydrazine hydrate, repeatedly washed with anhydrous hexanol, drying resulting product to obtain a porous graphene/ manganese dioxide midline coaxial nanowire material. An INDEPENDENT CLAIM is also included for a method for preparing a porous graphene/manganese dioxide midline coaxial nanowire material comprising steps as above per se.