期刊
NANO LETTERS
卷 17, 期 12, 页码 7652-7658出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03680
关键词
CeO2 nanocubes; atomic mobility; facet; surface; environmental transmission electron microscopy; high resolution transmission electron microscopy
类别
资金
- INSA Lyon through BQR project THERMOS
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
Ceria is one of the world's most prominent material for applications in heterogeneous catalysis, as catalyst support or catalyst itself. Despite an exhaustive literature on the structure of reactive facets of CeO2 in line with its catalytic mechanisms, the temporal evolution of the atomic surface structure exposed to realistic redox conditions remains elusive. Here, we provide a direct visualization of the atomic mobility of cerium atoms on {100} surfaces of CeO2 nanocubes at room temperature in high vacuum, O-2, and CO2 atmospheres in an environmental transmission electron microscope. Through quantification of the cationic mobility, we demonstrate the control of the surface dynamics under exposure to O-2 and CO2 atmospheres, providing opportunities for a better understanding of the intimate catalytic mechanisms.
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