纳米颗粒
催化作用
电化学
Atom(片上系统)
密度泛函理论
合金
材料科学
工作(物理)
纳米技术
化学
物理化学
计算化学
电极
物理
计算机科学
冶金
有机化学
热力学
嵌入式系统
作者
Yixiao Wang,Ming Wei,Qianchang Ding,Huimin Li,Wei Ma
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-15
标识
DOI:10.1021/acs.nanolett.3c04006
摘要
Regulating the atomic density of single-atom alloys (SAAs) promotes the potential to significantly enhance the electrocatalytic activity. However, conventional methods for study on the electrocatalytic performance of SAAs versus the intersite distance demand exhaustive experiments and characterization. Herein, we present a combinatorial synthesis and analysis method to investigate the intersite distance effect of SAA electrocatalysts. We employ single-nanoparticle collision electrochemistry to realize in situ electrodeposition of a precisely tunable Au atomic density onto individual parent Ag nanoparticles, followed by instantaneous electrocatalytic measurement of the newborn Au-Ag SAAs. In this work, the utility of our method is confirmed by the identification of intersite distance effects of Au-Ag SAAs toward the oxygen reduction reaction. When the site distance between two neighboring Au atoms is 1.9 nm, Au-Ag SAAs exhibit optimal activity. This work provides a simple and efficient method for screening other SAA electrocatalysts with ideal intersite distance at the single-nanoparticle level.
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