Nature of the dissociation sites of hydrogen molecules on Ru(001)

被引：25

作者：

Rose, Franck ^{[1
]}

Tatarkhanov, Mous ^{[1
,2
]}

Fomin, Evgeni ^{[1
,2
]}

Salmeron, Miquel ^{[1
,3
]}

机构：

[1] Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 51期

关键词：

D O I：

10.1021/jp075787v

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：

Scanning tunneling microscopy (STM) was used to study the dissociative adsorption of H-2 on Ru(001) near saturation coverage, when the number of residual hydrogen vacancies (i.e., unoccupied Ru sites) is small. We found that H-2 dissociation takes place only on Ru sites where the metal atom is not bound to any H atom. Such active sites are formed when at least 3 H-vacancies aggregate by thermal diffusion. Sites formed by single H-vacancies or pairs of adjoining vacancies were found to be unreactive toward H-2. As a similar phenomenon was found previously on Pd(111); the present results indicate that the active sites for H2 dissociation share a common characteristic among catalytically active transition metals.

引用

页码：19052 / 19057

页数：6

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