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C. Rehren, Martin Muhler, Xinhe Bao, Robert Schlögl, Gerhard Ertl

The Interaction of Silver with Oxygen: An Investigation with Thermal Desorption and Photoelectron Spectroscopy

Keywords: oxygenoverlayer, dissolved oxygen, fitting interstitial sites, silver oxide decomposition

Silver oxide decomposition Silver under ambient conditions is always covered at least with adsorbed atomic oxygen and coadsorbed CO₂ , and at 300K the low susceptibility of the metal to oxidation may thus be assigned to the existence of this overlayer. At elevated temperatures surface species are desorbed without leading to a higher reactivity of Ag. Our experiments showed that under these conditions in the presence of O₂ large amounts of dissolved oxygen are formed, and this species proved to be hard to remove either thermically or by heating the sample in hydrogen. According to the structural conditions of the silver lattice atomic oxygen fits perfectly into the octahedral holes so that dissolution is possible with hardly changing the atomic distances.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 174, 01/1991
Pages: 011 - 052

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