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The production of shape-controlled heterometallic nanoparticles (NPs) consisting of Pt and nonprecious metal oxides is crucial to demonstrate the composition-property relationship of NPs. Herein, we report a facile one-pot approach for the controlled synthesis of dumbbell-like Pt-Fe 3 O 4 -MnO  x  and dendritic Pt-MnO  x  NPs. The key to the success of this synthesis is in changing the quantity of Fe(CO) 5 additive to control the reaction kinetics. In the absence of Fe(CO) 5 , dendritic Pt-MnO  x  NPs were synthesized through the assembly of small seed NPs. On the other hand, dumbbell-like Pt-Fe 3 O 4 -MnO  x  NPs were obtained in the presence of Fe(CO) 5 through controlling the nucleation and growth of Fe and Mn on the Pt NPs, followed by air oxidation. Compared to a Pt/graphene oxide (GO) catalyst, dumbbell-like Pt-Fe 3 O 4 -MnO  x  NPs on GO showed an enhancement of specific activity toward the oxygen reduction reaction owing to the compressive-strain effect exerted on the Pt lattice.

Shape-Controlled Synthesis of Dumbbell-like Pt–Fe3O4–MnOx Nanoparticles by Governing the Reaction Kinetics

Shape-Controlled Synthesis of Dumbbell-like Pt–Fe₃O₄–MnO_x Nanoparticles by Governing the Reaction Kinetics