Interaction of H2O with the RuO2(110) surface studied by HREELS and TDS

被引：76

作者：

Lobo, A ^{[1
]}

Conrad, H ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 2003年 / 523卷 / 03期

关键词：

electron energy loss spectroscopy (EELS); thermal desorption spectroscopy; chemisorption; ruthenium; water;

D O I：

10.1016/S0039-6028(02)02459-7

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 adsorption of water on a RuO2,(110) surface was studied by using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). The first thermal desorption peak observed between 350 and 425 K is attributed to molecular water adsorbed on fivefold coordinated Ru-cus sites. Higher coverages of water give rise to TDS peaks between 190 and 160 K, which we attribute to water in the second layer bound to bridge oxygen, and multilayers, respectively. HREELS shows that H2O chemisorbs on Ru-cus sites through oxygen inducing a slight red shift of the vibrational frequency Of O-bridge atoms. Molecular adsorption is also confirmed by the presence of both the scissor and the libration modes showing the expected isotopic shift for D2O. The water adsorbed on the Ru-cus sites also forms hydrogen bonds with the bridge oxygen indicated by the broad intensity at the lower frequency side of the O-H stretch mode. HREELS and TDS results suggest that on the perfect RuO2 (110) surface water dissociation is almost negligible. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：279 / 286

页数：8

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