Low-Temperature CO Oxidation on Ni(111) and on a Au/Ni(111) Surface Alloy

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• 作者：Jan Knudsen ; Lindsay R. Merte ; Guowen Peng ; Ronnie T. Vang ; Andrea Resta ; Erik Lægsgaard ; Jesper N. Andersen ; Manos Mavrikakis ; Flemming Besenbacher
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：August 24, 2010
• 年：2010
• 卷：4
• 期：8
• 页码：4380-4387
• 全文大小：418K
• 年卷期：0
• ISSN：1936-086X

文摘

From an interplay between scanning tunneling microscopy, temperature programmed desorption, X-ray photoelectron spectroscopy, and density functional theory calculations we have studied low-temperature CO oxidation on Au/Ni(111) surface alloys and on Ni(111). We show that an oxide is formed on both the Ni(111) and the Au/Ni(111) surfaces when oxygen is dosed at 100 K, and that CO can be oxidized at 100 K on both of these surfaces in the presence of weakly bound oxygen. We suggest that low-temperature CO oxidation can be rationalized by CO oxidation on O₂-saturated NiO(111) surfaces, and show that the main effect of Au in the Au/Ni(111) surface alloy is to block the formation of carbonate and thereby increase the low-temperature CO₂ production.