Subsurface Oxygen Stabilization by a Third Species: Carbonates on Ag(210)

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• 作者：Letizia Savio ; Andrea Gerbi ; Luca Vattuone ; Raghani Pushpa ; Nicola Bonini ; Stefano de Gironcoli ; Mario Rocca
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：July 26, 2007
• 年：2007
• 卷：111
• 期：29
• 页码：10923 - 10930
• 全文大小：547K
• 年卷期：v.111,no.29(July 26, 2007)
• ISSN：1932-7455

文摘

Subsurface species have often been invoked to explain the activation of catalytic surfaces for specific reactions.In particular, subsurface oxygen is thought to be important for the chemistry of Ag catalysts. Here we showby experimental and theoretical methods that on Ag(210) subsurface oxygen is stabilized by carbonates moreefficiently than by O adatoms, thus leading to a concentration up to 4 times larger in the presence of theformer adsorbate. Experimentally, a maximum of six subsurface O atoms are found to be stabilized by eachcarbonate. These results might be relevant for the current efforts to bridge the structure and pressure gapsbetween surface science and industrial conditions, for which non-negligible amounts of carbonates are surelypresent.