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Potential Energy of H2 Dissociation and Adsorption on Pt(111) Surface: First-Principles Calculation
Nelson B. Arboleda, Jr.1,2,
Hideaki Kasai1,
Wilson A. Diño1,2,3,4, and
Hiroshi Nakanishi1
1Department of Precision Science and Technology and Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
2Physics Department, De La Salle University, Taft Ave., 1004 Manila, The Philippines
3Physics Department, Osaka University, Toyonaka, Osaka 560-8531, Japan
4Center for the Promotion of Research on Nanoscience and Nanotechnology, Osaka University, Toyonaka, Osaka 560-8531, Japan
(Received November 4, 2006; accepted March 27, 2007; published online July 4, 2007)
We investigate the interaction of molecular hydrogen with the Pt surface. In particular, we calculate the potential energy surfaces (PESs) corresponding to the dissociative adsorption of H2 at different symmetric sites on the Pt(111) surface and for parallel and perpendicular orientations of H2 with respect to the surface, on the basis of the density functional theory. The PES results show the dependence of the activation barriers on the H2 adsorption site and orientation relative to the surface. For parallel orientations, the barrier is lowest (almost zero) when the H2 center of mass (CM) is directly above the top site while the H atoms are directed towards the hcp and fcc hollow sites. The activation barriers for the perpendicular orientation are always much higher than those for the parallel orientation, which indicates that the parallel orientation is favored for H2 adsorption. This result also suggests that an incident H2 initially in a nonparallel (e.g., perpendicular) orientation tends to reorient itself towards a parallel orientation where it is easier for H2 to be adsorbed.
URL:
http://jjap.jsap.jp/link?JJAP/46/4233/
DOI: 10.1143/JJAP.46.4233
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