期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 45, 页码 25513-25521出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta05942d
关键词
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资金
- National Natural Science Foundation of China [91960202]
- National Key Research and Development Program of China [2017YFA0700701]
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [2019JH3/30100020]
- Chinese Academy of Sciences [QYZDJ-SSW-JSC024]
The study focuses on enhancing catalytic activity by constructing abundant low-coordinated sites, and uses atomic-resolution electron tomography to visualize the coordination environment of hierarchical nanoporous gold in three dimensions, revealing that the introduction of low-coordinated active sites significantly improves its catalytic performance in CO oxidation.
Boosting the activity of catalysts by constructing abundant low-coordinated sites is of considerable interest for maximizing the efficiency of catalysts. Equally importantly, three-dimensional imaging of these low-coordinated sites is crucial to the fundamental understanding of the relationship between the coordination environment and catalytic performance. Herein, we fabricate a novel class of hierarchical nanoporous gold which is rich in low-coordinated sites through solid-state plasma dealloying. For the first time, by using atomic-resolution electron tomography, we map out the coordination environment of the hierarchical nanoporous gold in three dimensions at the single-atom level. Quantitative coordination analysis reveals that owing to the introduction of substantial low-coordinated active sites with coordination numbers from 5 to 7, the catalytic performance of the hierarchical nanoporous gold in CO oxidation is improved. Our work provides in-depth insights into the relationship between the catalyst's coordination environment and catalytic performance, and the proof-of-concept demonstrated in this study is expected to be generally applicable to the design and study of a broad range of catalysts.
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