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MD simulation of water at imperfect platinum surfaces: Part I structure

Record type: Article

The aim of our work was to study the water structure at surfaces that contain imperfections. A series of molecular dynamics simulations of water at Pt(100) walls were performed while systematically introducing different types of imperfections onto the surface. Point dislocations, monoatomic steps, kink sites and rectangular terraces were considered. It was found that imperfections can lead to vacant surface sites and can loosen the rigid hydrogen bonded structure of the adsorbed water layer. A vacancy is filled with a water molecule, whereas on the step edges, the water molecules sit on top sites. Some of them point their dipole moment vector and one of the OH vectors towards the surface. This new water configuration provides a further possibility for hydrogen bonding between molecules on the step edge and at the step side. The majority of the water molecules at the step sides are also on top positions on the next row of Pt-atoms of the basal plane. However, a number of water molecules are adsorbed to Pt- atoms within the step. Around the corner of a terrace water molecules occupy top sites. A kink site on the surface is empty, but there is a water molecule immediately next to the site, built into the step. The kink is also surrounded by two other water molecules sitting on top positions of the basal plane. This unique configuration serves as a structural evidence explaining the well known fact, that kink sites act as starting points for adsorption and metal deposition processes. (C) 1997 Elsevier Science S.A.

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Citation

Nagy, Gabor and Denuault, Guy (1997) MD simulation of water at imperfect platinum surfaces: Part I structure Journal of Electroanalytical Chemistry, 433, (1-2), pp. 153-159. (doi:10.1016/S0022-0728(97)00218-0).

More information

Published date: 1997
Additional Information: YJ743
Keywords: molecular-dynamics simulation, aqueous-electrolyte, metal- surfaces, computer-simulation, interface, walls, ions, adsorption

Identifiers

Local EPrints ID: 179255
URI: http://eprints.soton.ac.uk/id/eprint/179255
ISSN: 1572-6657
PURE UUID: 8ab5502e-93eb-4ed9-8d0e-20099473878f
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 01 Apr 2011 09:18
Last modified: 18 Jul 2017 12:03

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Contributors

Author: Gabor Nagy
Author: Guy Denuault ORCID iD

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