Dynamic Surface Reconstruction of Single-Atom Bimetallic Alloy under Operando Electrochemical Conditions.
- 影响因子：11.189
- DOI码：10.1021/acs.nanolett.0c03475
- 发表刊物：Nano Lett.
- 关键字：Single atom alloy, Nanoparticles, Surface reconstruction, Bimetallic, Operando, Synchrotron radiation
- 摘要：The atomic-level understanding of the dynamic evolution of the surface structure of bimetallic nanoparticles under industrially relevant operando conditions provides a key guide for improving their catalytic performance. Here, we exploit operando X-ray absorption fine structure spectroscopy to determine the dynamic surface reconstruction of Cu/Au bimetallic alloy where single-atom Cu was embedded on the Au nanoparticle, under electrocatalytic conditions. We identify the migration of isolated Cu atoms from the vertex position of the Au nanoparticle to the stable (100) plane of the Au first atom layer, when the reduction potential is applied. Density functional theory calculations reveal that the surface atom migration would significantly modulate the Au electronic structure, thus serving as the real active site for the catalytic performance. These findings demonstrate the real structural change under electrochemical conditions and provide guidance for the rational design of high-activity bimetallic nanocatalysts.
- 合写作者：Chengcheng Ao, Xinyi Shen, Lan Wang, Sicong Wang, Linlin Cao, Wei Zhang, Jingjing Dong, Jun Bao, Lidong Zhang
- 第一作者：Xiaokang Liu
- 通讯作者：Tao Ding, Tao Yao
- 卷号：20
- 期号：11
- 页面范围：8319−8325
- 是否译文：否
- 发表时间：2020/10/22
- 发布期刊链接：https://pubs.acs.org/doi/full/10.1021/acs.nanolett.0c03475
