Intermetallic PtBi core/ultrathin Pt shell nanoplates for efficient and stable methanol and ethanol electro-oxidization

摘要

The development of Pt-based core/shell nanoparticles represents an emerging class of electrocatalysts for fuel cells,such as methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR).Here,we present a one-pot synthesis approach to prepare hexagonal PtBi/Pt core/shell nanostructure composed of an intermetallic Pt1Bi1 core and an ultrathin Pt shell with well-defined shape,size,and composition.The structure and the synergistic effect among different components enhanced their MOR and EOR performance.The optimized Pt1Bi nanoplates exhibit excellent mass activities in both MOR (4,820 mA·mgpt-1) and EOR (5,950 mA·mgPt-1) conducted in alkaline media,which are 6.15 times and 8.63 times higher than those of commercial Pt/C,respectively.Pt2Bi nanoplates also show superior operation durability to commercial Pt/C.This work may inspire the rational design and synthesis of Pt-based nanoparticles with improved performance for fuel cells and other applications.