▎ 摘　　要

NOVELTY - A noble metal single atom catalyst with high load quantity is prepared using in-situ photoreduction method by treating graphene aza, graphene oxide or three-dimensional network graphene oxide carrier by metal salt solution or metal alkali solution to load metal ion on surface, washing using deionized water and absolute ethanol to weak alkaline, ultrasonically dispersing, adding noble metal salt solution and carbonyl compound, mixing and magnetically stirring, and performing in-situ photoreduction and freeze-drying under illumination condition. USE - The method is used for preparing noble metal single atom catalyst with high load quantity using in-situ photoreduction method.