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.

引用

页码：2635 / 2638

页数：4

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