▎ 摘　　要

NOVELTY - Method for preparing single-atom catalyst involves (i) mixing graphene oxide dispersion liquid with foam transition metal and drying in protective atmosphere to obtain a foam metal-graphene oxide material, and (ii) subjecting the foamed metal-graphene oxide material to liquid-phase ultrasonic peeling to obtain the product. USE - The method is useful for preparing single-atom catalyst. ADVANTAGE - The method uses cheap foam transition metal as metal source, uses the surface dangling bond of the graphene oxide to capture the metal atoms of the foam metal surface at normal temperature, has uniform single atom distribution of the metal and excellent dispersion, controls the load of the metal single atom, is simple, controllable, economical, easy to expand production, and suitable for large scale production by increasing the area of foam transition metal and increasing the input amount of graphene oxide.