Interaction of hydrogen with metal oxides:: the case of the polar ZnO(0001) surface

被引：89

作者：

Becker, T ^{[1
]}

Hövel, S ^{[1
]}

Kunat, M ^{[1
]}

Boas, C ^{[1
]}

Burghaus, U ^{[1
]}

Wöll, C ^{[1
]}

机构：

[1] Ruhr Univ Bochum, D-44780 Bochum, Germany

来源：

SURFACE SCIENCE | 2001年 / 486卷 / 03期

关键词：

zinc oxide; hydrogen atom; sticking; atom-solid interactions;

D O I：

10.1016/S0039-6028(01)01120-7

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 formation and structure of hydrogen adlayers on the Zn-terminated ZnO(0 0 0 1) surface have been investigated by various analytical techniques. Whereas low energy electron diffraction data showed virtually no change upon H-atom adsorption, the highly surface sensitive method of He-atom scattering revealed for small H-coverages the formation of a H(1 x 1) overlayer. Surprisingly, for larger exposures to hydrogen (both atomic and molecular) the surface becomes highly unstable. Even before completion of the H(1 x 1) overlayer the polar Zn=ZnO-surface restructures, most likely as a consequence of subsurface OH-formation. The defects formed in this restructuring process are found to strongly increase the sticking coefficient of hydrogen molecules. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：L502 / L506

页数：5

共 30 条

[1] A KINETIC-MODEL OF METHANOL SYNTHESIS [J].