氧还原反应
纳米颗粒
氧还原
还原(数学)
纳米技术
氧气
化学
催化作用
材料科学
化学工程
组合化学
有机化学
电化学
物理化学
工程类
几何学
数学
电极
作者
Gerard M. Leteba,Sarah George,David R. G. Mitchell,Pieter Levecque,Eric van Steen,Lebohang Macheli,Candace Lang
标识
DOI:10.1002/cplu.202400083
摘要
We report the synthesis of core-shell Ni-Pt nanoparticles (NPs) with varying degrees of crystallographic facets and surface layers rich in Pt via a seed-mediated thermolytic approach. Mixtures of different surfactants used during synthesis resulted in preferential surface passivation, which in turn dictated the size, chemical composition, and geometric evolution of these PtNi NPs. Electrochemical investigations of these pristine core-shell Ni-Pt structures in the oxygen reduction reaction (ORR) show that their catalytic functionalities outperform the commercial Pt/C reference catalyst. The enhanced electrocatalytic ORR performances of these Pt-based PtNi NPs are correlated with the weakened oxygen binding strength or surface-adsorbed hydroxyl (OH) species on active Pt surface sites induced by the downshift of the d-band center as a result of compressive strain effects. Our studies offer a robust synthetic approach for the development of core-shell nanostructures for enhanced ORR catalysis.
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