▎ 摘　　要

NOVELTY - A graphene/carbonized chromium composite nano material preparing method involves dissolving chromium (III) nitrate nonahydrate in anhydrous ethanol, adding graphite dilute solution and nano carbon black powder. Urea is dissolved in absolute alcohol at a mass ratio of 1:1-8. The mixture is added with obtained solution, the mixed solution of complex graphene is added into the sonicated solution, drying in oven. The dried sample is placed in the crucible of a tubular furnace and pyrolyzed, followed by continuing to raise the temperature, cooling, collecting and grinding to obtain product. USE - Method for preparing graphene/carbonized chromium composite nano material. DETAILED DESCRIPTION - A graphene/carbonized chromium composite nano material preparing method involves dissolving chromium (III) nitrate nonahydrate in anhydrous ethanol, adding graphite dilute solution and nano carbon black powder at ratio of 1: 5-10, ultrasonically dispersing at 75-80 degrees C for 10-30 min. Urea is dissolved in absolute alcohol at a mass ratio of 1:1-8 under the stirring of water at 75-80 degrees C. The mixture is added with obtained solution, where the molar ratio of chromium (III) nitrate nonahydrate and urea is 1:5-1, the mixed solution of complex graphene is added into the sonicated solution, drying in oven at 800 degrees C for 2-3 hours. The dried sample is placed in the crucible of a tubular furnace and pyrolyzed at 500-600 degrees C for 1-3 hours under nitrogen atmosphere, followed by continuing to raise the temperature to 800-1200 degrees C for 2-4 hours, natural cooling, collecting and grinding to obtain product.