▎ 摘　　要

NOVELTY - Preparing nitrogen-doped graphene involves utilizing 5 g graphite, 1 g sodium nitrate, 2 g potassium nitrate and 2 g sodium bicarbonate. 150 ml Concentrated sulfuric acid is added into the beaker placed in ice water bath, and magnetically stirred for 1 hour. 15 g Potassium permanganate and sodium permanganate are added and continuously stirred. The temperature of the mixture in the beaker is controlled at /~30 degrees c, and then at normal temperature and stirred continuously for 24 hours. The beaker is placed in ice water bath. 300 ml De-ionized water is added and continuously stirred. The temperature is controlled at 98? oC, and then 30 ml 30% of hydrogen peroxide aqueous solution is added. The mixed solution is centrifuged for 30 minutes under the 8000 revolutions/minute. The upper layer liquid is removed and the precipitate is collected. 10 vol.% of hydrochloric acid solution is added to wash and centrifuged for 6 hours. USE - Method for preparing nitrogen-doped graphene applied to super capacitor (claimed). DETAILED DESCRIPTION - The precipitate is placed in the dialysis for 3 weeks and the salt ion and acid radical ion are removed to obtain oxidized graphite suspension. The graphite oxide suspension is dispersed in deionized water and ultrasonicated for 1 hour at the speed of 3000 revolutions/minute. The material is centrifuged for 30 minutes to obtain oxidized graphene water dispersing liquid which is configured as 0.3mg/ml of graphene oxide water dispersion. 1 ml 28 wt.% liquor ammonia and 80 mu l of 80 wt.% hydrazine solution is added to 500 ml dispersion, and then placed in the side port plug made of glass,and stirred. The mixture is cooled, and then reacted for 1 hour in oil bath at 95 degrees C. The material is naturally cooled to the room temperature in the fume hood. The the black suspension liquid is removed, filtered and dried to obtain the reduction oxidation graphene suspension. 6 mol/l potassium hydroxide solution is added to 40 ml obtained product and stirred for 12h, and placed under the normal temperature for 2 hours. The material is frozen at -55 degrees C and dried for 72hours. The vacuumizing operation is carried out to a tubular furnace, at the heating speed is 20 degrees C/minute, where the target temperature is 800 degrees C for 30 minutes. The argon is introduced at flow rate of 400 standard cubic centimeters per minute, the working pressure is 100 Pascals. The material is cooled and 10% of hydrochloric acid solution is added to wash for 2 hours, then de-ionized water is used for washing until the pH value is 7. The material is frozen and the product is dried to obtain the potassium hydroxide activation of reduction-oxidation graphene. The product is heated at speed of 20 degrees C/minute to 800 degrees C for 1hours, and naturally cooled. The ammonia gas is introduced at the flow rate is 100 standard cubic centimeters per minute, the flow rate of the argon gas is 20 standard cubic centimeters per minute, the working pressure is 1000Pascals. The argon gas is continuously introduced at the cooling stage, at the flow of 400 argon gas to obtain the graphene doped with nitrogen.