Hydrophilic Interaction Between Low-Coordinated Au and Water: H2O/Au(310) Studied with TPD and XPS

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• 作者：Matthijs A. van Spronsen ; Kees-Jan Weststrate ; Angela den Dunnen ; Maarten E. van Reijzen ; Christine Hahn ; Ludo B. F. Juurlink
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 28, 2016
• 年：2016
• 卷：120
• 期：16
• 页码：8693-8703
• 全文大小：674K
• 年卷期：0
• ISSN：1932-7455

文摘

In this work, we study the relatively weak H₂O–Au interaction on the highly stepped and anisotropic (310) surface with temperature-programmed desorption and X-ray photoelectron spectroscopy. Compared to Au(111), we report an enhanced adsorption energy of H₂O–Au(310) as observed from the (sub)monolayer desorption peak. This peak shows zero-order desorption kinetics, which we do not explain with a typical two-phase coexistence model but rather by desorption from the ends of one-dimensional structures. These could cover both the steps and (part of) the terraces. We do not observe crystallization of ice clusters as observed on Au(111). This leads to the conclusion that this stepped surface forms a hydrophilic template for H₂O adsorption. We also notice that the precise orientation of the steps determines the H₂O binding strength. Despite the surface’s enhanced H₂O interaction, we do not observe any significant H₂O dissociation. This indicates that the presence of low-coordinated Au atoms is not enough to explain the role of H₂O in Au catalysis.