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A Reactive Oxide Overlayer on Rhodium Nanoparticles during CO Oxidation and Its Size Dependence Studied by In Situ Ambient-Pressure X-ray Photoelectron Spectroscopy

Authors

  • Michael E. Grass,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Yawen Zhang Prof.,

    1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P.R. China)
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  • Derek R. Butcher,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Jeong Y. Park Dr.,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Yimin Li Dr.,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Hendrik Bluhm Dr.,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Kaitlin M. Bratlie Dr.,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Tianfu Zhang Dr.,

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • Gabor A. Somorjai Prof.

    1. Department of Chemistry; University of California, Berkeley, Chemical and Materials Sciences Divisions, Lawrence Berkeley National Laboratory; Berkeley, CA 94720 (USA), Fax: (+1) 510-643-9668
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  • This work was supported by the Director, Office of Science, Office of Advanced Scientific Computing Research, Office of Basic Energy Sciences, Materials Sciences and Engineering, and Chemical Sciences, Geosciences, and Biosciences Division of the U.S. Department of Energy under Contract Nos. DE-AC02-05CH11231 and DE-AC03-76SF00098. We also thank the Molecular Foundry and the Advanced Light Source, LBNL for use of their facilities and Prof. Miquel Salmeron and Dr. Zhi Liu for valuable discussions. Y.W.Z. appreciates financial aid with a Huaxin Distinguished Scholar Award from Peking University Education Foundation of China.

Abstract

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Je kleiner, desto besser: Mithilfe von In-situ-Röntgenphotoelektronenspektroskopie mit Synchrotronstrahlung unter Umgebungsdruck gelang es, den Oxidationszustand der Oberfläche von Rhodium-Nanopartikeln (NPs) während der CO-Oxidation unter O2 zu bestimmen. 2 nm große NPs oxidieren bei 150–200 °C stärker als 7 nm große NPs und zeigen eine fünffach höhere Umsatzfrequenz.

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