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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 292324.1, Fritz-Haber-Institut / Inorganic Chemistry
Reduction of an α-Fe2O3(0001) Film Using Atomic Hydrogen
Authors:Huang, Weixin; Ranke, Wolfgang; Schlögl, Robert
Research Context:ac19: Iron oxide model catalysts: Adsorption and catalysis
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Issue / Number:5
Start Page:2198
End Page:2204
Number of Words:5967
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:The α-Fe2O3(0001)-biphase surface consists of an ordered arrangement of FeO(111) and α-Fe2O3(0001) surface domains on a Fe2O3 bulk [N.G. Condon et al., Phys. Rev. Lett. 75, 1961, 1995]. The interaction of atomic hydrogen Hat with this surface has been investigated at room temperature (RT, 300 K) by means of low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and thermal desorption mass spectroscopy (TDS). The surface is easily hydroxylated by Hat. Upon heating, the OH groups react to produce hydrogen and water, the latter of which results in the partial reduction of the surface. In a parallel but slower process, bulk reduction proceeds already during exposure at RT. First, Fe3O4(111) domains, embedded in the α-Fe2O3(0001) matrix are formed. Finally, the film is completely reduced to Fe3O4. Further reduction towards FeO or metallic Fe appears kinetically hindered and is not observed under the low exposures used in our experiments.
Last Change of the Resource (YYYY-MM-DD):2006-11-29
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Department of Chemical Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
URL:http://pubs.acs.org/cgi-bin/article.cgi/jpccck/200... [only for subscriber]
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