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  Hydrogen Evolution from Metal-Surface Hydroxyl Interaction

Fujimori, Y., Kaden, W., Brown, M. A., Roldan Cuenya, B., Sterrer, M., & Freund, H.-J. (2014). Hydrogen Evolution from Metal-Surface Hydroxyl Interaction. The Journal of Physical Chemistry C, 118(31), 17717-17723. doi:10.1021/jp504655e.

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 Urheber:
Fujimori, Yuichi1, Autor           
Kaden, William1, Autor           
Brown, Matthew A.1, Autor           
Roldan Cuenya, Beatriz1, Autor           
Sterrer, Martin1, Autor           
Freund, Hans-Joachim1, Autor           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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 Zusammenfassung: The redox interaction between hydroxyl groups on oxide surfaces and metal atoms and clusters deposited thereon, according to which metals get oxidized and hydrogen released, is an effective route to tune both the morphological (particle size and shape) and electronic (oxidation state) properties of oxide-supported metals. While the oxidation state of the metals can straightforwardly be probed by X-ray based methods (e.g., XPS), hydrogen is much more difficult to capture, in particular in highly reactive systems where the redox interaction takes place directly during the nucleation of the metals at room temperature. In the present study, the interaction of Pd with a hydroxylated MgO(001) surface was studied using a combination of vibrational spectroscopy, electronic structure studies including Auger parameter analysis, and thermal desorption experiments. The results provide clear experimental evidence for the redox nature of the interaction by showing a direct correlation between metal oxidation and hydrogen evolution at slightly elevated temperature (390 K). Moreover, a second hydrogen evolution pathway opens up at 500 K, which involves hydroxyl groups on the MgO support and carbon monoxide adsorbed on the Pd particles (water–gas shift reaction).

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Sprache(n): eng - English
 Datum: 2014-07-082014-05-122014-07-092014-07-092014-08-07
 Publikationsstatus: Erschienen
 Seiten: 7
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/jp504655e
 Art des Abschluß: -

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Titel: The Journal of Physical Chemistry C
  Andere : J. Phys. Chem. C
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington DC : American Chemical Society
Seiten: - Band / Heft: 118 (31) Artikelnummer: - Start- / Endseite: 17717 - 17723 Identifikator: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766