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Interaction of oxygen with the (111) surface of NaAu2

TitleInteraction of oxygen with the (111) surface of NaAu2
Publication TypeJournal Article
Year of Publication2016
AuthorsKwolek, EJ, Widmer, R, Groning, O, Deniz, O, Walen, H, Yuen, CD, Huang, WK, Schlagel, DL, Wallingford, M, Brundle, CR, Thiel, PA
JournalSurface Science
Date Published08
Type of ArticleArticle
ISBN Number0039-6028
Accession NumberWOS:000377837800023
Keywordsadsorption, au nanoparticles, auger, carbonate, chemistry, gold catalysts, intermetallic, low-temperature, methanol, NaAu2, nanoporous gold, oxidation, oxide, physics, xps

NaAu2, in powder form, is known to be an active catalyst for CO oxidation. The goal of the present study is to elucidate the interaction of one reactant, molecular oxygen, with a single-crystal surface of this material, NaAu2(111). Exposing the clean surface to gas-phase molecular oxygen produces three types of oxygen on the surface. One type is bound in spurious carbonate that forms during exposure. The second is adsorbed atomic oxygen that interacts both with Na and Au. The third type is atomic oxygen that interacts mainly or only with Na. We propose that the last species is an oxide of Na distributed throughout the surface and near-surface region. Its formation is accompanied by surface segregation of Na. (C) 2015 Elsevier B.V. All rights reserved.

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Short TitleSurf. Sci.
Alternate JournalSurf. Sci.