▎ 摘　　要

NOVELTY - Crystalline nanoporous graphene, is new. The crystalline nanoporous graphene has three significant X-ray powder diffraction peaks, they are 7 degrees , 25 degrees and 43 degrees respectively, belonging to the hexagonal crystal system, and the space group is P6/mmm, the unit cell parameters are as specified and the specific surface area of the crystalline nanoporous graphene is 400-800 m2/g, and the pore size distribution is concentrated in 0.4-0.5 nm. USE - The crystalline nanoporous graphene is useful for oxygen-doped crystalline nanoporous graphene as electrocatalyst for preparing hydrogen peroxide by electrolysis (claimed). ADVANTAGE - The crystalline nanoporous graphene makes electrocatalyst has high selectivity and catalytic activity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the crystalline nanoporous graphene, comprising (i) keeping the polycyclic halogenated aromatic hydrocarbons under 0.5-3 GPa pressure for 0.5-48 hours, making the pressure holding is over, restoring normal pressure to obtain precursor, heating the precursor to 200-400 degrees C and keeping for 3-20 hours, cooling to room temperature, and heating to 400-600 degrees C for 2-10 hours, and obtaining crystalline nanoporous graphite, and (ii) ball milling the crystalline nanoporous graphite, adding the obtained powder into the solvent for ultrasonic peeling, ultrasonicating for 1-3 hours, centrifuging the product at low speed at 500-1500 revolutions/minute for 1-5 minutes, taking the supernatant, and centrifuging the supernatant at high speed at 800-12000 revolutions/minute for 1-5 minutes, taking the precipitate and drying; and (2) preparing oxygen-doped crystalline nanoporous graphene, comprising heating the crystalline nanoporous graphene to 200-400 degrees C in an atmosphere with oxygen concentration of 10-20%, oxidizing for 3-20 hours, obtaining oxygen-doped crystalline nanoporous graphene, where oxygen exists in the form of hydrogen-oxygen bonds, carbon-oxygen double bonds and carbon-oxygen single bonds.