▎ 摘　　要

NOVELTY - Preparation of nano metal-graphene composite material involves (S1) pre-oxidizing graphite, adding concentrated sulfuric acid, potassium persulfate and phosphorus pentoxide in order into container placed in high-temperature environment, stirring until complete mixing, adding graphite powder, stirring, diluting, filtering, washing, drying to obtain pre-oxidized graphite (A), (S2) reoxidizing graphite (A), adding graphite (A) and potassium permanganate into sulfuric acid, stirring, mixing at low temperature environment, adding deionized water to dilute, adding hydrogen peroxide in dropwise to remove redundant oxides, leaving still, taking out a lower-layer precipitate after the solution turns to golden yellow, washing, ultrasonically treating, drying to obtain graphene oxide (B), and (S3), mixing metal salt ion solution and oxide (B), adjusting to alkaline, adding reducing agent for reduction reaction or high-temperature inert atmosphere reduction, washing and drying. USE - Preparation of nano metal-graphene composite material used in hydrogen storage (all claimed). ADVANTAGE - The method provides composite material having excellent stability, adjustable morphology and structure, excellent hydrogen storage performance, high stripping degree and low layer number, and reduces metal salt solution and graphene oxide homogeneous mixed solution through one-step reaction, which can greatly improves the dispersion degree of each phase, and effectively avoids the agglomeration effect. The method is simple, economical, low-valence combining the graphene and hydrogen overflow effect to improves the hydrogen storage performance of graphene material, and avoids the reaction of concentrated sulfuric acid and potassium permanganate at high temperature, reduces danger of operation, and realizes simultaneous reduction of graphene oxide and nano metal by high-temperature inert atmosphere method.