Water Formation under Silica Thin Films: Real-Time Observation of a Chemical Reaction in a Physically Confined Space

Mauricio J. Prieto, Hagen W. Klemm, Feng Xiong, Daniel M. Gottlob, Dietrich Menzel, Thomas Schmidt, Hans Joachim Freund

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

39 Zitate (Scopus)

Abstract

Using low-energy electron microscopy and local photoelectron spectroscopy, water formation from adsorbed O and H2 on a Ru(0001) surface covered with a vitreous SiO2 bilayer (BL) was investigated and compared 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 to the requirement of site release by O adatoms for further H2-dissociative adsorption. Apparent activation energies ((Eapp a)) are found 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 the reaction on the 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 Eapp a in confined space.

OriginalspracheEnglisch
Seiten (von - bis)8749-8753
Seitenumfang5
FachzeitschriftAngewandte Chemie International Edition in English
Jahrgang57
Ausgabenummer28
DOIs
PublikationsstatusVeröffentlicht - 9 Juli 2018

Fingerprint

Untersuchen Sie die Forschungsthemen von „Water Formation under Silica Thin Films: Real-Time Observation of a Chemical Reaction in a Physically Confined Space“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren