▎ 摘　　要

NOVELTY - Three-dimensional nitrogen-doped graphene airgel preparation involves taking natural graphite powder as a carbon source in a mixed solvent of water and ethanol in a volume ratio of 0.5-5:1 with magnetic stirring at room temperature for 0.5-2 hours, and then performing ultrasonic dispersion for 0.5-2 hours to obtain graphene oxide sol. The obtain graphene oxide sol is mixed with urea and trisodium citrate in a mass ratio of 1-20:1-5:1. USE - Method for preparing three-dimensional nitrogen-doped graphene airgel. ADVANTAGE - The method is simple in operation, low in cost and easy to realize industrialization. DETAILED DESCRIPTION - Three-dimensional nitrogen-doped graphene airgel preparation involves taking natural graphite powder as a carbon source in a mixed solvent of water and ethanol in a volume ratio of 0.5-5:1 with magnetic stirring at room temperature for 0.5-2 hours, and then performing ultrasonic dispersion for 0.5-2 hours to obtain graphene oxide sol. The obtain graphene oxide sol is mixed with urea and trisodium citrate in a mass ratio of 1-20:1-5:1 at room temperature under stirring for 0.5-2 hours, and then ultrasonically dispersed for 0.5-2 hours. The glacial acetic acid is added dropwise to the obtained sol in under stirring in a volume ratio of 0.25-1:1, and then ultrasonically dispersion for 0.5-2 hours to obtain viscous graphene sol. The obtained viscous sol is transferred to a hydrothermal reaction vessel at 120-180 degrees C for 8-12 hours and then cooled to obtain three-dimensional nitrogen-doped graphene gel. The obtained three-dimensional nitrogen-doped graphene gel is dipped and washed with ethanol and then dried to obtain the three-dimensional nitrogen-doped graphene airgel. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic scanning electron microscopic image of the prepared three-dimensional nitrogen-doped graphene airgel.