In situ infrared monitoring of hydrogen adsorption desorption at a germanium electrode

被引：14

作者：

Maroun, F ^{[1
]}

Ozanam, F ^{[1
]}

Chazalviel, JN ^{[1
]}

机构：

[1] Ecole Polytech, CNRS, Phys Mat Condensee Lab, F-91128 Palaiseau, France

来源：

SURFACE SCIENCE | 1999年 / 427-28卷

关键词：

Ge electrode; germanium; hydrogen adsorption; hydrogen desorption; infrared spectroscopy;

D O I：

10.1016/S0039-6028(99)00262-9

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：

Upon potential cycling in acidic electrolyte, the coverage of Ge electrodes call be changed from GeH to GeOH. In situ infrared spectroscopy reveals that hydrogen adsorbs and desorbs at Ge in mono- and dihydride configurations. Comparison of (111)- and (100)-oriented electrodes shows that the Ge surface is rough at the atomic scale and that this roughening takes place through(lll) microfacetting. This facetting call account for the attenuated polarization dependence of the GeH absorption and its enhancement through local field effects. Finally, the band edge shifts which are observed upon hydrogen adsorption/desorption appear related to a change in the Ge surface charge rather than to a dipolar effect. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：184 / 189

页数：6

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