期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 3, 期 7, 页码 839-843出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz300159p
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- INTEVEP
- U.S. Department of Energy
Our results indicate that small amounts of an oxide deposited on a stable metal surface can trigger a massive surface reconstruction under reaction conditions. In low-energy electron microscopy (LEEM) experiments, no reconstruction of Cu(111) is observed after chemisorbing oxygen or after reducing O/Cu(111) in a CO atmosphere. On the other hand, LEEM images taken in situ during the reduction of CeO2/CuO1-x/Cu(111) show a complex nonuniform transformation of the surface morphology. Ceria particles act as nucleation sites for the growth of copper microterraces once CuO1-x is reduced. Can this reconstructed surface be used to enhance the catalytic activity of inverse oxide/metal catalysts? Indeed, CeOx on reconstructed Cu(111) is an extremely active catalyst for the water gas shift process (CO + H2O -> H-2 + CO2), with the Cu microterraces providing very efficient sites for the dissociation of water and subsequent reaction with CO.
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