▎ 摘　　要

NOVELTY - Preparation of carbon nanofiber-loaded ordered-reduced graphene oxide composite involves adding 1 g ionic liquid surface-modified graphene oxide, and polymer to a solvent at mass ratio of 1:100-10:100, stirring under action of ultrasonic wave at 300 W for 4-8 hours, forming electrospinning solution having a solid content of 20-30 wt.%, electrospinning to obtain graphene oxide-polymer electrospun fibers on an electrospinning receiver, heat treating at 0.3-0.5 degrees C/minutes, from room temperature to 120 degrees C in air atmosphere for 2 hours, at 120-280 degrees C and 0.5-1.5 degrees C/minute for 2 hours and at 280-1000 degrees C and 3-5 degrees C/minute for 2 hours in an argon atmosphere, and vertically aligning the resultant product on the surface of carbon nanofibers. USE - Preparation of carbon nanofiber-loaded ordered-reduced graphene oxide composite used as electrode for supercapacitor (claimed). ADVANTAGE - The method provides carbon nanofiber-loaded ordered-reduced graphene oxide having stable performance and high specific surface area. The composite increase the charge storage density and charge transfer rate of the supercapacitor. The supercapacitor has high capacity and excellent charge and discharge efficiency. DETAILED DESCRIPTION - The ionic liquid surface-modified graphene oxide is prepared by mixing 10 g 1000-5000 mesh flake graphite as raw material, 200-400 mL concentrated sulfuric acid, 4-6 g sodium nitrate, 0.5 g hydrogen peroxide and 20-40 g potassium permanganate strong oxidant, performing Hummer method to obtain an aqueous graphene oxide solution, ultrasonically treating at 60-100 KHz and 1-3 KW for 10-30 minutes, to obtain dispersion solution of graphene oxide sheet having thickness of 10-30 nm and size of 0.1-2 mu m, performing acid removal and ion purification in a deionized water using a semipermeable membrane, replacing deionized water for every 6 hours until the pH of the semi-permeable membrane solution becomes 7, vacuum drying at 40 degrees C for 12 hours, dissolving 10 g obtained graphene oxide in deionized water, adding 0.1-0.5 g ionic liquid containing a reactive group chosen from carboxyl group, sulfonic acid group, amino group and hydroxyl group, surface modifying, obtaining ionic liquid-modified graphene oxide, centrifuging at 10000-12000 rpm for 10-30 minutes to remove the supernatant liquid in a centrifuge tube, removing ionic liquid-modified graphene oxide at a bottom of the centrifuge tube, and vacuum drying at 40 degrees C for 12 hours. An INDEPENDENT CLAIM is included for usage method of the carbon nanofiber-loaded ordered-reduced graphene oxide composite in supercapacitor, which involves cutting the carbon nanofiber-loaded ordered-reduced graphene oxide composite into an electrode piece having a diameter of 3 cm and a thickness of 300 mu m, and bonding to a surface of a metal collector using a conductive adhesive, drying under vacuum at 80 degrees C for 12 hours, assembling a polypropylene separator paper, and an ionic liquid electrolyte, in an argon atmosphere in a glove box having a water content of less than 100 ppm, to form supercapacitor having specific capacitance of 223.1 CP/F.g-1 to 231.6 CP/F.g-1, and the charge and discharge efficiency is 99.5-99.7%. The ionic liquid electrolyte is 1-propyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-ethyl-3-methylimidazolium tetrafluoroborate.