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An In situ TEM study of the surface oxidation of palladium nanocrystals assisted by electron irradiation

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Abstract

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.

Graphical abstract: An In situ TEM study of the surface oxidation of palladium nanocrystals assisted by electron irradiation

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Publication details

The article was received on 09 Nov 2016, accepted on 13 Feb 2017 and first published on 15 Feb 2017


Article type: Paper
DOI: 10.1039/C6NR08763A
Citation: Nanoscale, 2017, Advance Article
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    An In situ TEM study of the surface oxidation of palladium nanocrystals assisted by electron irradiation

    D. Zhang, C. Jin, H. Tian, Y. Xiong, H. Zhang, P. Qiao, J. Fan, Z. Zhang, Z. Y. Li and J. Li, Nanoscale, 2017, Advance Article , DOI: 10.1039/C6NR08763A

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