Chemical composition and reactivity of water on clean and oxygen-covered Pd{111}

被引：42

作者：

Gladys, M. J. ^{[2
,3
]}

El Zein, A. A. ^{[2
]}

Mikkelsen, A. ^{[4
]}

Andersen, J. N. ^{[4
]}

Held, G. ^{[1
,2
]}

机构：

[1] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England

[2] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

[3] Univ Newcastle, Sch Math & Phys Sci, Callaghan, NSW 2308, Australia

[4] Lund Univ, Dept Phys, S-22100 Lund, Sweden

来源：

SURFACE SCIENCE | 2008年 / 602卷 / 22期

基金：

英国工程与自然科学研究理事会;

关键词：

Palladium; Water; Oxygen; Photoelectron spectroscopy; Chemisorption; Catalysis;

D O I：

10.1016/j.susc.2008.09.031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The chemical composition and dissociation behaviour of water adsorbed on clean and oxygen pre-covered Pd{111} was studied using high-resolution time-resolved and temperature-programmed X-ray photoelectron spectroscopy. We find that water remains intact at all temperatures up to desorption on the clean surface and at high oxygen coverage(0.69 ML) when a surface oxide is formed. The highest desorption peaks occur at 163 K from the clean surface and at 172 K from the surface oxide. At the intermediate coverage of 0.20 ML oxygen reacts with coadsorbed water at 155 K, to generate a mixed H2O/OH layer exhibiting a (root 3- x root 3)R30 degrees diffraction pattern, which is stable up to 177 K. The measured ratio between intact water and the hydroxyl species in this layer varies between 1.5 and 2 depending on temperature. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：3540 / 3549

页数：10

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