In Situ Observation of Water Dissociation with Lattice Incorporation at FeO Particle Edges Using Scanning Tunneling Microscopy and X-ray Photoelectron Spectroscopy

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• 作者：Xingyi Deng ; Junseok Lee ; Congjun Wang ; Christopher Matranga ; Funda Aksoy ; Zhi Liu
• 刊名：Langmuir
• 出版年：2011
• 出版时间：March 15, 2011
• 年：2011
• 卷：27
• 期：6
• 页码：2146-2149
• 全文大小：739K
• 年卷期：v.27,no.6(March 15, 2011)
• ISSN：1520-5827

文摘

The dissociation of H₂O and formation of adsorbed hydroxyl groups on FeO particles grown on Au(111) were identified with in situ X-ray photoelectron spectroscopy (XPS) at water pressures ranging from 3 脳 10^鈭? to 0.1 Torr. The facile dissociation of H₂O takes place at FeO particle edges, and it was successfully observed in situ with atomically resolved scanning tunneling microscopy (STM). The in situ STM studies show that adsorbed hydroxyl groups were formed exclusively along the edges of the FeO particles with the O atom becoming directly incorporated into the oxide crystalline lattice. The STM results are consistent with coordinatively unsaturated ferrous (CUF) sites along the FeO particle edge causing the observed reactivity with H₂O. Our results also directly illustrate how structural defects and under-coordinated sites participate in chemical reactions.