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Interaction of silver with oxygen on sputtered pyrolytic graphite

Title
Interaction of silver with oxygen on sputtered pyrolytic graphite
Authors
Jeong S.H.Lim D.C.Boo J.-H.Lee S.B.Hwang H.N.Hwang C.C.Kim Y.D.
Ewha Authors
김영독
Issue Date
2007
Journal Title
Applied Catalysis A: General
ISSN
0926-860XJCR Link
Citation
vol. 320, pp. 152 - 158
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Using core level spectra, it has been observed previously that the oxidation of silver nanoparticles deposited on sputter-damaged highly ordered pyrolytic graphite (HOPG) surfaces is very different from that taking place on surfaces composed entirely of silver. It is generally accepted that the final stage of the oxidation of silver is the formation of Ag 2O/AgO. However, in the case of silver nanoparticles on HOPG, Ag 2O/AgO can be further oxidized to give a species of unknown composition. In the present work it has been demonstrated that under these oxidizing conditions silver nanoparticles deposited on HOPG form silver carbonate. This implies that strong metal support interactions are responsible for the different behavior of silver nanoparticles on HOPG compared to that of silver in bulk. Carbonate formation is further suggested to be responsible for the deactivation of silver catalysts. © 2007 Elsevier B.V. All rights reserved.
DOI
10.1016/j.apcata.2007.01.026
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자연과학대학 > 화학·나노과학전공 > Journal papers
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