Water Formation on Clean and Vanadium Oxide Covered Pd(111) by Permeating Deuterium

详细信息    查看全文

• 作者：Markus J. Kratzer ; Johanna Stettner ; Adolf Winkler
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：August 30, 2007
• 年：2007
• 卷：111
• 期：34
• 页码：12723 - 12729
• 全文大小：206K
• 年卷期：v.111,no.34(August 30, 2007)
• ISSN：1932-7455

文摘

In this work the formation of D₂O on vanadium oxide (VO_x) thin film nano structures on Pd(111) has beeninvestigated. Quadrupole mass spectrometry has been used to determine the flux of the reaction productsdesorbing from the surface. In separate experiments low-energy electron diffraction and Auger electronspectroscopy were applied to monitor possible changes in the surface composition under reaction conditions.The experiments were carried out at sample temperatures of 523 and 700 K. The water reaction was fed withatomic deuterium via bulk permeation and simultaneous dosing of molecular oxygen. It turned out that theVO_x coverage as well as the sample temperature have significant influence on the reaction. The D₂O formationrate drops with increasing VO_x coverage and increases with rising sample temperature. Additionally, wefound evidence that the VO_x structures change during water formation, especially at 700 K.