期刊
NANOSCALE
卷 9, 期 19, 页码 6327-6333出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr08763a
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资金
- National Natural Science Foundation of China [11227403, 51472215, 51222202, 91545113]
- Cyrus Tang Center for Sensor Materials and Applications
- Engineering and Physical Sciences Research Council [EP/G070326/1]
- Qiushi Foundation
- 111 project [B16042]
- Engineering and Physical Sciences Research Council [EP/G070326/1] Funding Source: researchfish
- EPSRC [EP/G070326/1] Funding Source: UKRI
The surface oxidation of palladium nanocrystals plays an important role in changing the active sites and subsequently influencing the catalytic reactivity. Such a microscopy study on surface oxidation, down to the atomic scale, is essential for understanding the structure-property correlations of palladium nanocrystal based catalysts. Herein, we present an in situ atomic scale study on the surface oxidation behavior of palladium nanocrystals, which is induced by electron beam irradiation under low oxygen partial pressure and at room temperature inside an environmental transmission electron microscope. We found that: (i) surface oxidation initially started at the edge sites with atomic steps or vertex sites, which served as active sites for oxidation; (ii) the oxidation reaction proceeded with a much faster rate on the {111} surface, indicating a certain crystallography preference; (iii) nanometer-sized palladium monoxide islands were formed on the surfaces eventually. The results from our in situ studies provide insightful knowledge, and will be of certain importance for the design of improved functional catalysts in future.
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