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

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 Abstract: 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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Language(s): eng - English
 Dates: 2014-07-082014-05-122014-07-092014-07-092014-08-07
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp504655e
 Degree: -

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Title: The Journal of Physical Chemistry C
  Other : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 118 (31) Sequence Number: - Start / End Page: 17717 - 17723 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766