The Importance of Bulk Ti3+ Defects in the Oxygen Chemistry on Titania Surfaces

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• 作者：Estephania Lira ; Stefan Wendt ; Peipei Huo ; Jonas 脴. Hansen ; Regine Streber ; S酶ren Porsgaard ; Yinying Wei ; Ralf Bechstein ; Erik L忙gsgaard ; Flemming Besenbacher
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：May 4, 2011
• 年：2011
• 卷：133
• 期：17
• 页码：6529-6532
• 全文大小：753K
• 年卷期：v.133,no.17(May 4, 2011)
• ISSN：1520-5126

文摘

The role of bulk defects in the oxygen chemistry on reduced rutile TiO₂(110)鈭?1 脳 1) has been studied by means of temperature-programmed desorption spectroscopy and scanning tunneling microscopy measurements. Following O₂ adsorption at 130 K, the amount of O₂ desorbing at 410 K initially increased with increasing density of surface oxygen vacancies but decreased after further reduction of the TiO₂(110) crystal. We explain these results by withdrawal of excess charge (Ti³⁺) from the TiO₂(110) lattice to oxygen species on the surface and by a reaction of Ti interstitials with O adatoms upon heating. Important consequences for the understanding of the O₂鈭扵iO₂ interaction are discussed.