Chemical composition and reactivity of water on hexagonal Pt-group metal surfaces

被引：60

作者：

Shavorskiy, A. ^{[1
]}

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

Held, G. ^{[1
]}

机构：

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

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

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2008年 / 10卷 / 40期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1039/b808235a

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 dissociation behaviour and valence-electronic structure of water adsorbed on clean and oxygen-covered Ru{0001}, Rh{111}, Pd{111}, Ir{111} and Pt{111} surfaces has been studied by high-resolution X-ray photoelectron spectroscopy with the aim of identifying similarities and trends within the Pt-group metals. On average, we find higher reactivity for the 4d metals (Ru, Rh, Pd) as compared to 5d (Ir, Pt), which is correlated with characteristic shifts in the 1b(1) and 3a(1) molecular orbitals of water. Small amounts of oxygen (<0.2 ML) induce dissociation of water on all five surfaces, for higher coverages (>0.25 ML) only intact water is observed. Under UHV conditions these higher coverages can only be reached on the 4d metals, the 5d metals are, therefore, not passivated.

引用

页码：6150 / 6159

页数：10

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