Effect of Water Vapor on Oxidation Processes of the Cu(111) Surface and Sublayer.

Copper-based catalysts have different catalytic properties depending on the oxidation states of Cu. We report operando observations of the Cu(111) oxidation processes using near-ambient pressure scanning tunneling microscopy (NAP-STM) and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). The Cu(111) surface was chemically inactive to water vapor, but only physisorption of water molecules was observed by NAP-STM. Under O environments, dry oxidation started at the step edges and proceeded to the terraces as a CuO phase. Humid oxidation of the HO/O gas mixture was also promoted at the step edges to the terraces. After the CuO covered the surface under humid conditions, hydroxides and adsorbed water layers formed. NAP-STM observations showed that CuO was generated at lower steps in dry oxidation with independent terrace oxidations, whereas CuO was generated at upper steps in humid oxidation. The difference in the oxidation mechanisms was caused by water molecules. When the surface was entirely oxidized, the diffusion of Cu and O atoms with a reconstruction of the CuO structures induced additional subsurface oxidation. NAP-XPS measurements showed that the CuO thickness in dry oxidation was greater than that in humid oxidation under all pressure conditions.