Tuning the Branches and Composition of PtCu Nanodendrites through Underpotential Deposition of Cu towards Advanced Electrocatalytic Activity
Controlled synthesis of Pt-based bimetallic nanocrystals with tunable size and structure has been demonstrated the great potential to advance their electrocatalytic performances. We present herein a facile but effective strategy for the rapid aqueous synthesis of PtCu nanodendrites (NDs) with advanced electrocatalytic performance. The systematical investigation on the influence of reaction conditions on the formation of PtCu NDs reveals that the underpotential deposition of Cu not only accelerates the growth of NDs but also significantly modulates its size and branch structure as well as the composition. The electrochemical tests demonstrates that Pt55Cu45 ND with smaller size and less branches but higher content of Cu exhibits the highest electrocatalytic activity for both oxygen reduction reaction and methanol oxidation reaction, comparing with Pt92Cu8 ND, Pt ND and commercial Pt/C. These results may inspire the engineering of a wide range of metallic alloyed nanocrystals to advance their electrocatalytic performances for diverse applications.