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A simple and effective approach was demonstrated to synthesize flowerlike Pt nanocrystals on polydopamine(PDA)functionalized reduced oxide graphene(RGO).Inspired by mussels,the PDA/RGO composites were obtained via the reduction of GO nanosheets by dopamine,followed by simultaneous capping by PDA.Then,the synthesis of Pt flowerlike nanocrystals assembled with small elongated nanoparticles on PDA/RGO(Pt(F)-PDA/RGO)was carried out by mixing H 2 PtCl 6 with PDA/RGO in the presence of ascorbic acid under boiling.PDA as a surface-adherent and multifunctional biopolymer played a dual role: dispersing stable RGO into aqueous solution and providing functional groups to bind metal ions and metal nanoparticles.The as-prepared Pt(F)-PDA/RGO catalyst showed considerably improved catalytic activity and stability toward methanol electrooxidation,compared with Pt nanoclusters on PDA/RGO(Pt(C)-PDA/RGO)and Pt nanoparticles on pristine graphene sheets(Pt/RGO).The kinetic characterization of Pt(F)-PDA/RGO was further discussed by cyclic voltammetry.This simple and green approach could be applicable to other metallic nanocrystals as a novel platform in catalysis,fuel cells and biosensors.