扫描隧道显微镜
催化作用
电化学
电化学噪声
Atom(片上系统)
量子隧道
电催化剂
电解质
纳米技术
化学物理
氢原子
原子单位
化学
材料科学
扫描电化学显微镜
分析化学(期刊)
电极
物理化学
光电子学
物理
有机化学
嵌入式系统
量子力学
计算机科学
烷基
作者
Marco Lunardon,Tomasz Kosmala,Christian Durante,Stefano Agnoli,Gaetano Granozzi
出处
期刊:Joule
[Elsevier]
日期:2022-03-01
卷期号:6 (3): 617-635
被引量:9
标识
DOI:10.1016/j.joule.2022.02.010
摘要
Summary
Electrochemical scanning tunneling microscopy (EC-STM) allows direct observation of surface changes at the atomic scale in the presence of an electrolyte at different electrochemical potentials. Recently, it has been demonstrated that the noise in the tunneling current of EC-STM allows identifying electrocatalytically active sites under reaction conditions. However, this method has never been applied to atom-by-atom investigations and could not provide a quantitative evaluation of the catalytic activity. Using the hydrogen evolution reaction as case study, we demonstrate that the quantitative analysis of the noise in the tunneling current allows quantifying the local onset potential and provides information about the microscopic mechanism of electrochemical reactions on subnanometric electrocatalytic sites, such as chemically heterogeneous flat interfaces, nanoparticles, and even single-atom defects. This unique method allows surpassing the current limits of not only the state-of-the-art EC-STM but also other operando and microscopy techniques.
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