Title

Dissociation and sticking of H2 on Mg(0001), Ti(0001) and La(0001) surfaces

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of the Physical Society of Japan

Volume

73

Issue

3

First Page

745

Last Page

748

Publication Date

3-1-2004

Abstract

We performed quantum dynamics calculations using previously obtained potential energy surfaces (PESs) for the dissociative adsorption of hydrogen molecule incident on a Mg(0001), Ti(0001), and La(0001) surface. Based on the sticking probability plots we obtained as functions of the incidence H 2 beam energy, La is the best material for hydrogen storage, followed by Ti, and then by Mg. This is due to the absence of an activation barrier in the H2/La(0001) system. Both H2/Ti(0001) and H 2/Mg(0001) systems have activation barriers, but the H 2/Ti(0001) system has a very small activation barrier far from the curved region of the reaction path, while the H2/Mg(0001) system has a high activation barrier close to the curved region along the reaction path. Our results also indicate that the sticking probability has some dependence on the vibrational state of the impending H2 molecule for the Mg, Ti and La surfaces. The degree of dependence still varies in each metal. Vibrational effect is most observed with Mg, followed by Ti, and then by La. © 2004 The Physical Society of Japan.

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Digitial Object Identifier (DOI)

10.1143/JPSJ.73.745

Disciplines

Physics

Keywords

Quantum theory; Adsorption; Hydrogen—Storage; Alloys

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