▎ 摘　　要

NOVELTY - Method for preparing an iodine-doped porous grafted-carbon nitride supported graphene electrocatalytic material involves (a) adding natural stone powder and sodium nitrate to concentrated nitric acid, stirring, adding potassium permanganate in an oil bath, reacting, adding deionized water and hydrogen peroxide, filtering, washing, drying and centrifuging to obtain a 3-dimensional porous graphene oxide, (b) adding melamine to hydrochloric acid solution, stirring, reacting and drying to obtain a melamine salt, adding deionized water and amine iodide to the melamine salt, ultrasonically dispersing and heating to obtain an iodine-doped porous grafted-carbon nitride, and (c) dispersing the obtained nitride in a nitric acid solution, hydrothermally reacting and drying to obtain protonated iodine-doped grafted-carbon nitride, mixing it with 3-dimensional porous graphene oxide and hydrothermally reacting to obtain the product. USE - The method is useful for preparing iodine-doped porous grafted-carbon nitride supported graphene electrocatalytic material. ADVANTAGE - The material improves electrical conductivity, has excellent structural stability and electrocatalytic hydrogen evolution performance, has improved porous structure, reduces charge transfer resistance, promotes electron transfer and ion transmission efficiency, and solves problem of low electron mobility of materials. DETAILED DESCRIPTION - Method for preparing an iodine-doped porous grafted-carbon nitride supported graphene electrocatalytic material involves (a) adding natural stone powder and sodium nitrate to concentrated nitric acid, stirring, adding potassium permanganate in an oil bath, reacting at 30-40 degrees C for 20-40 minutes, adding deionized water, reacting at 80-90 degrees C for 10-20 minutes, adding deionized water and hydrogen peroxide, filtering, washing, drying and centrifuging to obtain a 3-dimensional porous graphene oxide, (b) adding melamine to hydrochloric acid solution, stirring and reacting for 1-3 hours, separating and drying to obtain a melamine salt, adding the melamine salt to deionized water, adding amine iodide, ultrasonically dispersing, removing water at 60-80 degrees C, grinding uniformly, heating at 500-600 degrees C at a heating rate of 5-10 degrees C/minute in an atmosphere furnace under a nitrogen atmosphere for 2-3 hours to obtain an iodine-doped porous grafted-carbon nitride, and (c) dispersing iodine-doped porous grafted-carbon nitride in a nitric acid solution, stirring at room temperature for 4-6 hours, hydrothermally reacting at 140-160 degrees C for 1-3 hours, washing and drying to obtain protonated iodine-doped grafted-carbon nitride, mixing the protonated iodine-doped grafter-carbon nitride and the 3-dimensional porous graphene oxide with deionized water, ultrasonically dispersing and hydrothermally reacting to obtain the product.