▎ 摘　　要

NOVELTY - Preparing full triazine covalent framework comprises introducing argon gas into 1, 4-dioxane solvent, adding 1, 3, 5-triazine and cyanuric chloride into the 1, 4-dioxane solvent, dispersing uniformly, where the total mass of 1,3,5-triazine and cyanuric chloride added to each 60 ml of 1,4-dioxane is 500 mg, adding N, N-diisopropyl ethylamine catalyst and conductive carbon material into the uniformly dispersed solution, mixing uniformly to obtain the reaction liquid, subjecting reaction liquid to polymerization under the protection of argon gas at 70-100 degrees C for 8-24 hours, filtering the reactant, cleaning and drying. USE - The framework is useful in the field of electrocatalysis and fuel cell. The M-N-C single atom catalyst is useful for proton-exchange membrane fuel cells (PEMFC) cathode oxygen reduction reaction (claimed). ADVANTAGE - The method: uses conductive carbon materials and C3N3 build a complete conductive structure together; ensures the material, which has the ability of rapid electron migration; enhances conductivity, which can quickly promote the transfer of electrons from the electrode to the catalytic site; uses C3N3 belongs to CTFs in the N/C ratio (1:1), which is much higher than all other CTFs reported; is economical; has high activity, and good stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMs are also included for: (1) full triazine covalent framework, prepared by above method; and (2) preparing M-N-C single atom catalyst based on the full triazine covalent framework comprising uniformly mixing the full triazine covalent framework and transition metal salt in water, then reacting for 4-6 hours at 60-90 degrees C, water washing and drying to obtain M-triazine (MC3N3), where M is a transition metal element in the transition metal salt, calcining the M-C3N3 at 600-1000 degrees C for 1-1 hours under the nitrogen environment, and carbonizing, then removing impurities from the carbonized product by concentrated acid, cleaning and drying, calcining the dried solid for the second time under the ammonia environment, calcining for 20-60 minutes at 650-850 degrees C to obtain the target product M-NC; and (3) M-N-C single atom catalyst, prepared by above method.