Activation of Oxygen on MgO: O2•- Radical Ion Formation on Thin, Metal-Supported MgO(001) Films

被引：91
|
作者：
Gonchar, Anastasia [2 ]
Risse, Thomas [2 ,3 ]
Freund, Hans-Joachim [2 ]
Giordano, Livia [1 ]
Di Valentin, Cristiana [1 ]
Pacchioni, Gianfranco [1 ]
机构：
[1] Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
[2] Max Planck Gesell, Fritz Haber Inst, Dept Chem Phys, D-14195 Berlin, Germany
[3] Free Univ Berlin, Inst Chem & Biochem, D-14195 Berlin, Germany
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2011年 / 50卷 / 11期
关键词：
heterogeneous catalysis; oxidation; oxygen activation; surface chemistry; thin films; PARAMAGNETIC-RESONANCE; SURFACE; EXCHANGE; DENSITY; ATOMS; MODEL;
D O I：
10.1002/anie.201005729
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Distortion is the key: In situ EPR spectroscopy provides the first experimental confirmation that the adsorption of O2 molecules on a stoichiometric ultrathin MgO(001) film on Mo(001) leads to the spontaneous formation of O2.- radicals. The results show that polaronic distortion of the MgO lattice (see picture; Mg yellow, O blue) stabilizes the radical, and this distortion is only possible in very thin films. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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收藏
页码：2635 / 2638
页数：4
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