期刊
NANO LETTERS
卷 14, 期 3, 页码 1172-1177出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403895s
关键词
CO oxidation; heterogeneous catalyst; environmental transmission electron microscopy; nanoporous metal; In situ TEM
类别
资金
- JST-PRESTO New Materials Science and Element Strategy
- JSPS KAKENHI [25708036]
- National Basic Research Program of China [2012CB932800]
- National Science Foundation of China [51171092]
- Advanced Characterization Nanotechnology Platform of the High Voltage Electron Microscope Laboratory of Nagoya University
- Grants-in-Aid for Scientific Research [25708036] Funding Source: KAKEN
Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.
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