▎ 摘　　要

NOVELTY - Multi-dendritic core-shell structure nanocomposite material includes nanoparticles used as core, graphene quantum dots (GQDs) as interlayer, and platinum-lead (Pt-Pb) alloy as shell layer which are combined to form a multi-dendritic core-shell structure. USE - Multi-dendritic core-shell structure nanocomposite material used as a catalyst in methanol oxidation reaction (claimed). ADVANTAGE - The multi-dendritic core-shell structure nanocomposite material has greatly improved electrocatalytic activity, catalytic performance and tolerance and stability to carbon monoxide poisoning having potential application prospects in direct-methanol fuel cells. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing multi-dendritic core-shell structure nanocomposite material, which involves: (A) adding graphene quantum dots and chloroauric acid into water under stirring and mixing uniformly at 80-100 degrees C; (B) adding sodium citrate for reacting for 20-40 minutes; (C) cooling at room temperature to centrifuge to obtain graphene quantum dots nanoparticles; (D) adding chloroplatinic acid solution to the obtained graphene quantum dots solution under stirring for 3-8 minutes; (E) adding reducing agent ascorbic acid at room temperature for 0.5-2 hours; (F) centrifuging and rinsing the reaction product with ethanol and water continuously to remove residues to obtain platinum doped graphene quantum dots core-shell nanospheres; (G) adding lead nitrate to the prepared platinum doped graphene quantum dots solution by adding ascorbic acid at 40-60 degrees C for 1-3 hours; and (H) centrifuging the reaction product with ethanol and water to remove residues to get the target product core-shell structure nanocomposite was obtained.