CO-Induced Embedding of Pt Adatoms in a Partially Reduced FeOx Film on Pt(111)
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- 作者：Lindsay R. Merte ; Jan Knudsen ; Falk M. Eichhorn ; Soeren Porsgaard ; Helene Zeuthen ; Lars C. Grabow ; Erik L忙gsgaard ; Hendrik Bluhm ; Miquel Salmeron ; Manos Mavrikakis ; Flemming Besenbacher
- 刊名：Journal of the American Chemical Society
- 出版年：2011
- 出版时间：July 20, 2011
- 年：2011
- 卷：133
- 期：28
- 页码：10692-10695
- 全文大小：827K
- 年卷期：v.133,no.28(July 20, 2011)
- ISSN：1520-5126
文摘
The reduction of a single-layer FeO film grown on Pt(111) by CO at elevated pressures and temperatures has been studied through an interplay of scanning tunneling microscopy, ambient-pressure X-ray photoelectron spectroscopy, and density functional theory calculations. Exposure of the FeO thin film to CO at pressures between 1 and 30 Torr and temperatures between 500 and 530 K leads to formation of a honeycomb-structured Fe3O2 film with hollow sites occupied by single Pt atoms extracted from the substrate surface. The formation of these adatoms is driven by an increase in CO adsorption energy. In addition, the structure incorporates undercoordinated Fe centers, which are proposed to have substantial effects on the catalytic properties of the surface.