Hydrogen adsorption on transition-metal carbide (111) surfaces

被引：25

作者：

Aizawa, T

Hayami, W

Souda, R

Otani, S

Ishizawa, Y

机构：

[1] Natl. Inst. for Res. in Inorg. Mat., Tsukuba, Ibaraki 305

来源：

SURFACE SCIENCE | 1997年 / 381卷 / 2-3期

关键词：

carbides; chemisorption; electron energy loss spectroscopy; hydrogen; low index single crystal surfaces; vibrations of adsorbed molecules;

D O I：

10.1016/S0039-6028(97)00108-8

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：

Vibrational frequency of H and D adsorbed on IVa and Va transition-metal carbide (TMC) (111) surfaces has been studied by high-resolution electron energy loss spectroscopy. Hydrogen (deuterium) was adsorbed dissociatively, showing the vibrational mode in an energy range of 110-120 (80-88) meV on ZrC(111), HfC(111) and NbC(111) surfaces, but at a much higher energy of 208 (149) meV on TaC(111). The former is similar to the case of H/TiC(111) consistent with three-fold hollow site adsorption. The latter seems too high to be explained by a variation of the force constant. It seems likely that on TaC(111), hydrogen is adsorbed on a different site from the other H/TMC(111) systems. (C) 1997 Elsevier Science B.V.

引用

页码：157 / 164

页数：8

共 19 条

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