標題: Formation, Binding, and Stability of O-Ag-CO2-Ag-O Compounds on Ag(100) Investigated by Low Temperature Scanning Tunneling Microscopy and Manipulation
作者: Hsieh, Ming-Feng
Li, Hong-Doa
Lin, Deng-Sung
Morgenstern, Karina
物理研究所
Institute of Physics
公開日期: 26-Aug-2010
摘要: The understanding of reaction intermediates in heterogeneous catalysis has important implications for the design of novel catalysts. We investigate the adsorption of CO2 on oxygen precovered Ag(100) at low temperature (17 K) by scanning tunneling microscopy and inelastic electron tunneling manipulation at 5 K. On the terraces, the adsorption leads to O-Ag-CO2-Ag-O compounds with reduced binding of the oxygen to the surface as compared to the separately adsorbed molecules. The compound can be either dissociated into a bistable O-Ag-CO2 compound at 1.6 V, dissociated into its constituents at 2.2 V, or reacted at 6.5 V into a species, which we tentatively attribute to CO3. The thus obtained carbon trioxide or carbonate is an intriguing reaction intermediate, because it is not stable in the gas phase. Our detailed study of coadsorbed species outlines a possibility to investigate precursors of reactions that involve the substrate atoms.
URI: http://dx.doi.org/10.1021/jp104170b
http://hdl.handle.net/11536/149996
ISSN: 1932-7447
DOI: 10.1021/jp104170b
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 114
起始頁: 14173
結束頁: 14179
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