▎ 摘　　要

NOVELTY - Method for preparing nitrogen-doped graphene-supported iron single-atom catalyst involves (a) choosing carbon nitride as a nitrogen source, tannic acid as a carbon source, iron acetylacetonate or iron phthalocyanine as an iron source, 4-diethylamino-salicylaldehyde, ethanol solution and deionized water, (b) dispersing carbon nitride in deionized water by ultrasonic waves, adding the iron source into deionized water containing tannic acid, mixing and stirring, adding 4-diethylamino-salicylaldehyde into the ethanol solution, (c) mixing and stirring, (d) subjecting the uniformly dispersed solution in step (b) to hydrothermal treatment through a hydrothermal kettle, (e) centrifuging and drying the homogeneously dispersed solution after hydro-heating, and (f) calcining the iron/carbon nitride with TA-salicylaldehyde precursor at a high temperature in a nitrogen atmosphere. USE - Method for preparing nitrogen-doped graphene-supported iron single-atom catalyst used in energy conversion and storage facilities and technologies such as fuel cell and metal-air cell. ADVANTAGE - The method prepares nitrogen-doped graphene-supported iron single atom catalyst by modifying carbon nitride with tannic acid, exhibits excellent ORR activity, has excellent oxygen reduction catalytic effect and excellent application prospect. DETAILED DESCRIPTION - Method for preparing nitrogen-doped graphene-supported iron single-atom catalyst involves (a) choosing carbon nitride as a nitrogen source, tannic acid as a carbon source, iron acetylacetonate or iron phthalocyanine as an iron source, 4-diethylamino-salicylaldehyde, ethanol solution and deionized water, (b) dispersing carbon nitride in deionized water by ultrasonic waves to obtain a uniformly dispersed solution (I), adding the iron source into deionized water containing tannic acid, mixing and stirring to obtain a uniform solution (II), adding 4-diethylamino-salicylaldehyde into the ethanol solution, mixing and stirring to obtain a uniform solution (III), (c) mixing and stirring solution (I), solution (II) and solution (III) to obtain a uniformly dispersed solution, (d) subjecting the uniformly dispersed solution in step (b) to hydrothermal treatment through a hydrothermal kettle, (e) centrifuging and drying the homogeneously dispersed solution after hydro-heating to obtain iron/carbon nitride with TA-salicylaldehyde precursor, and (f) calcining the iron/carbon nitride with TA-salicylaldehyde precursor at a high temperature in a nitrogen atmosphere to obtain a nitrogen-doped graphene-supported iron single-atom catalyst.