氢气与 ZnO 的相互作用：表面吸附与体相扩散。

Interaction of hydrogen with ZnO: surface adsorption versus bulk diffusion.

机构信息

Department of Chemistry, Kyungpook National University, Daegu, 702-701 Korea.

出版信息

Langmuir. 2010 Nov 2;26(21):16278-81. doi: 10.1021/la101369r.

PMID:20973579

Abstract

The interaction of hydrogen (H) and a ZnO(0001)-O surface has been investigated using a temperature programmed desorption (TPD) technique. When the surface is exposed to atomic hydrogen below 400 K, hydrogen is adsorbed on the surface. As the hydrogen exposure increases, bulk diffusion of hydrogen takes place. The existence of surface and bulk hydrogen has been confirmed using X-ray photoelectron spectroscopy (XPS). When the ZnO surface dosed with hydrogen is heated, surface hydrogen is desorbed at 432 K and bulk hydrogen is evolved at ∼539 K. Diffusion of hydrogen into the ZnO bulk is an activated process, and the activation energy is estimated to be 0.19 eV.

摘要

使用程序升温脱附（TPD）技术研究了氢（H）与 ZnO(0001)-O 表面的相互作用。当表面暴露于 400 K 以下的原子氢时，氢会吸附在表面上。随着氢气暴露量的增加，氢气发生体相扩散。使用 X 射线光电子能谱（XPS）证实了表面和体相氢的存在。当 ZnO 表面注入氢气后被加热时，表面氢在 432 K 下脱附，而体相氢在约 539 K 下释放。氢扩散进入 ZnO 体相是一个活化过程，其活化能估计为 0.19 eV。