Surface chemistry of Cu in the presence of CO2 and H2O
Xingyi Deng1, Albert Verdaguer, Tirma Herranz
1Materials Sciences Division, Lawrence Berkeley National Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, and Materials Science and Engineering Department, University of California, Berkeley, California 94720, USA.
Abstract:
The chemical nature of copper and copper oxide (Cu 2O) surfaces in the presence of CO 2 and H 2O at room temperature was investigated using ambient pressure X-ray photoelectron spectroscopy. The studies reveal that in the presence of 0.1 torr CO 2 several species form on the initially clean Cu, including carbonate CO 3 (2) (-), CO 2 (delta-) and C (0), while no modifications occur on an oxidized surface. The addition of 0.1 ML Zn to the Cu results in the complete conversion of CO 2 (delta-) to carbonate. In a mixture of 0.1 torr H 2O and 0.1 torr CO 2, new species are formed, including hydroxyl, formate and methoxy, with H 2O providing the hydrogen needed for the formation of hydrogenated species.
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