▎ 摘　　要

NOVELTY - Carbon-based confined-interface supported palladium single-atom catalyst, is claimed. The phase is hollow spherical. The spherical wall is carbon-based confined-interface composed of reduced graphene oxide and nitrogen-sulfur co-doped amorphous carbon. The nitrogen-sulfur co-doped amorphous carbon comprises 9.1-7.2 wt.% nitrogen and 6.7-5.5 wt.% sulfur. The palladium single-atom is anchored between confined interfaces and the loading amount is 0.21-0.55 wt.%. USE - Used as carbon-based confined-interface supported palladium single-atom catalyst. ADVANTAGE - The method improves loading amount and stability of single-atom catalyst by accurately regulating each key parameter, step and reaction condition in preparation process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing palladium single-atom catalyst, comprising (i) dispersing aminated silica nanospheres in ultrapure water, slowly adding graphene oxide dispersion while stirring, continuously stirring to coat graphene oxide by electrostatic adsorption and centrifugally separating the product to obtain composite silica-graphene oxide, (ii) dissolving and dispersing composite silica-graphene oxide, rhodenine and oxidant in deionized water, polymerizing in an oil bath at 80-90 degrees C for 18-24 hours, coating a layer of polyrhodenine on composite silica-graphene oxide, cooling to room temperature, centrifuging to collect precipitate and drying to obtain composite silica-graphene oxide-polyrhodenine, (iii) placing step (ii) product in a tubular furnace, introducing inert gas, heating to 700-1000 degrees C at a rate of 5-10 degrees C/minute, annealing for 1-2 hours, cooling, taking out powder, removing silica template using hydrofluoric acid, suction filtering and freeze-drying to obtain carbon-based carrier reduced graphene oxide-nitrogen-sulfur co-doped amorphous carbon composite material, and (iv) dispersing step (iii) product in deionized water to obtain aqueous dispersion, adding palladium metal salt precursor into the solution under ice bath environment, reacting by stirring for 1-3 hours, suction filtering and freeze-drying to obtain final product.