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Adsorption, Activation, and Dissociation of Oxygen on Doped Oxides

Authors

  • Dr. Yi Cui,

    1. Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany)
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    • These authors contributed equally to this work.

  • Dr. Xiang Shao,

    1. Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany)
    2. Present address: Department of Chemical Physics, University of Science & Technology, Hefei 230026 (China)
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    • These authors contributed equally to this work.

  • Dipl.-Chem. Matthias Baldofski,

    1. Institut für Chemie, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin (Germany)
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  • Prof. Joachim Sauer,

    1. Institut für Chemie, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin (Germany)
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  • Dr. Niklas Nilius,

    Corresponding author
    1. Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany)
    2. Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26111 Oldenburg (Germany)
    • Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany)

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  • Prof. Hans-Joachim Freund

    1. Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany)
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  • We thank the DFG for financial support within the Excellence Cluster “UniCat” and the Humboldt Foundation (fellowship to Y.C.).

Abstract

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Charge transfer in the presence of dopants is relevant for the adorption and activation of small molecules, such as O2. Scanning tunneling microscopy and DFT calculations provide evidence for the formation of strongly bound superoxo species on chemically inert, Mo-doped CaO films (see picture). This oxygen surface species shows a high propensity to dissociate. Dopants could also be important for the activation of hydrocarbons on inert oxides.

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