▎ 摘　　要

NOVELTY - Preparing asymmetric coordination single-atom catalyst from graphene quantum dot synthesis, comprises (i) adding 1,3,6-trinitropyrene into the N source solution/O source solution and sonicating for 6-7 hours, then placing obtained suspension into polytetrafluoroethylene-lined autoclave, heating, cooling, collecting the filtrate by filtration and placing in a dialysis bag for dialysis for 2-4 days to obtain amino-rich graphene quantum dot solution and hydroxy-rich graphene quantum dot solution, the N source is aqueous ammonia or hydrazine hydrate, and the O source is sodium hydroxide or potassium hydroxide, and (ii) mixing amino-rich graphene quantum dot solution and hydroxy-rich graphene quantum dot solution, stirring, then ultrasonically mixing, adding copper nitrate solution and stirring, ultrasonically dispersing, placing into freeze-dryer and freeze-drying, then mixing and grinding the obtained product with urea, carbonizing in an argon atmosphere to obtain final product. USE - The asymmetric coordination single-atom catalyst from graphene quantum dot synthesis is useful as an electrode material for electrocatalytic synthesis of urea (claimed). ADVANTAGE - The method: controls the catalytic activity of the composite molecular catalyst by changing the type or number of the functional groups grafted at the end of the graphene quantum dot. The asymmetric coordination single-atom catalyst: achieves efficient and directional conversion of carbon dioxide and nitrate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use method of asymmetric coordination single-atom catalyst from graphene quantum dot synthesis. The method utilizes mixed solution composed of absolute ethanol, deionized water and Nafion(sulfonated tetrafluoroethylene based fluoropolymer-copolymer), silver/silver chloride and carbon dioxide saturated sodium nitrate solution.