▎ 摘　　要

NOVELTY - Nitrogen-doped graphene-coated iron cobalt nanocrystals preparation involves dissolving potassium hexacyanocobaltate (III) in distilled water to get solution A, and then dissolving ferrous sulfate and polyvinylpyrrolidone in distilled water at room temperature to get solution B. The obtained solution B is added in the solution A with magnetic stirring slowly, and then kept for 22-25 hour at room temperature to develop a yellow precipitate of ferrous cobalti-cyanide, which is centrifugally separated. USE - Method for preparing nitrogen-doped graphene-coated iron cobalt nanocrystals used as a catalyst in nitro phenol reduction (claimed). ADVANTAGE - The method prepares nitrogen-doped graphene-coated iron cobalt nanocrystals has high activity and stability, and can be prepared in a simple manner on industrial scale. DETAILED DESCRIPTION - Nitrogen-doped graphene-coated iron cobalt nanocrystals preparation involves dissolving potassium hexacyanocobaltate (III) in distilled water to get solution A, and then dissolving ferrous sulfate and polyvinylpyrrolidone in distilled water at room temperature to get solution B. The obtained solution B is added in the solution A with magnetic stirring slowly, and then kept for 22-25 hour at room temperature to develop a yellow precipitate of ferrous cobalti-cyanide, which is centrifugally separated. The separated precipitate is placed in crucible in a high temperature furnace in inert gas atmosphere for 3-5 hour to perform thermal decomposition to form nitrogen-doped graphene-coated iron cobalt nanocrystals. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic high resolution electron microscope image of the nitrogen-doped graphene-coated iron cobalt nanocrystals.