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  Water formation below silica thin films: Real time observation of a chemical reaction in a physically confined space

Prieto, M., Klemm, H., Xiong, F., Gottlob, D. M., Menzel, D., Schmidt, T., et al. (2018). Water formation below silica thin films: Real time observation of a chemical reaction in a physically confined space. Angewandte Chemie. doi:10.1002/ange.201802000.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0001-50A6-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0001-50B2-B
Genre: Journal Article

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2018
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 Creators:
Prieto, Mauricio1, Author           
Klemm, Hagen1, Author           
Xiong, Feng2, Author
Gottlob, Daniel M.1, Author
Menzel, Dietrich1, 3, Author           
Schmidt, Thomas1, Author           
Freund, Hans-Joachim1, Author           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Department of Chemical Physics, University of Science and Technology of China, Hefei 230026. P. R. China, ou_persistent22              
3Also at Physik-Department E20, Technical University München, 85778 Garching, Germany, ou_persistent22              

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 Abstract: Using low energy electron microscopy and local photoelectron spectroscopy, we investigated the water formation from adsorbed O and H₂ on a Ru(0001) surface covered with a vitreous SiO₂ bilayer (BL) and compared it to the same reaction on bare Ru(0001). In both cases the reaction is characterized by moving reaction fronts. The reason for this might be related with the requirement of site release by O adatoms for further H₂ dissociative adsorption. We find apparent activation energies (E_a^app) for the front motion of 0.59 eV without cover and 0.27 eV under cover. We suggest that the smaller activation energy but higher reaction temperature for SiO₂ BL covered Ru(0001) surface is due to a change of the rate‐determining step. Other possible effects of the cover are discussed. Our results give the first values for E_a^app in confined space, thus leading to potentially new approaches of physical confinement effects on reaction rates, including theoretical modelling.

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Language(s): eng - English
 Dates: 2018-04-112018-02-142018-04-112018-04-16
 Publication Status: Published online
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/ange.201802000
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Title: Angewandte Chemie
  Abbreviation : Angew. Chem.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 5 Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 0044-8249
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058_1