▎ 摘　　要

NOVELTY - Polyacrylonitrile powder is added to N,N-dimethylformamide solvent, stirred and electrostatically spun, to obtain polyacrylonitrile nanofiber membrane. The polyacrylonitrile nanofiber membrane is pre-oxidized, soaked in graphene oxide solution and high-temperature carbonized with inert gas, to obtain graphene/carbon nanofiber composite membrane. The graphene/carbon nanofiber composite film is hydrothermal reacted with homogeneous salt solution containing cobalt salt, zinc salt and urea, to obtain zinc-cobalt oxide/graphene/carbon nano-fiber composite material. USE - Preparation of zinc-cobalt oxide/graphene/carbon nano-fiber composite material used for electrocatalytic material, lithium-ion battery, and electrode material for solar cell (all claimed). ADVANTAGE - The method enables preparation of zinc-cobalt oxide/graphene/carbon nano-fiber composite material having high specific surface area and excellent conductivity. DETAILED DESCRIPTION - Polyacrylonitrile powder is added to N,N-dimethylformamide solvent and stirred, to obtain viscous uniform dispersion. The viscous uniform dispersion of polyacrylonitrile is electrostatically spun, to obtain polyacrylonitrile nanofiber membrane. The polyacrylonitrile nanofiber membrane is pre-oxidized in air, to obtain pre-oxidized polyacrylonitrile nano fiber membrane. Pre-oxidized polyacrylonitrile nano fiber membrane is soaked in graphene oxide solution, to obtain polyacrylonitrile nanofiber/graphene oxide composite film. The polyacrylonitrile nanofiber/graphene composite film is high-temperature carbonized with inert gas, to obtain graphene/carbon nanofiber composite membrane. Cobalt salt, zinc salt and urea are added to deionized water, to obtain homogeneous salt solution. The graphene/carbon nanofiber composite film is hydrothermal reacted with homogeneous salt solution, to obtain zinc-cobalt oxide/graphene/carbon nano-fiber composite material.