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Carbonate formation and decomposition on atomic oxygen precovered Au(111) |
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| Authors: | Ojifinni Rotimi A Gong Jinlong Froemming Nathan S Flaherty David W Pan Ming Henkelman Graeme Mullins C Buddie |
| Institution: | University of Texas at Austin, Departments of Chemical Engineering and Chemistry, Center for Nano- and Molecular Science and Technology, and Texas Materials Institute, 1 University Station C0400, Austin, Texas 78712-0231 |
| Abstract: | Experimental results supported by density functional theory calculations show carbonate formation and reaction on atomic oxygen precovered Au(111). Oxygen mixing is observed in temperature-programmed desorption measurements when a Au(111) precovered with 16O is exposed to isotopically labeled CO2 (C18O2). The presence of 16O18O is attributed to surface carbonate formation and decomposition at surface temperatures ranging from 77-400 K and initial oxygen coverages ranging from 0.18-2.1 ML. A reaction probability on the order of 10(-4) and an activation energy of -0.15+/- 0.08 eV are estimated for this reaction. |
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