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Water Adlayers on Noble Metal Surfaces: Insights from Energy Decomposition Analysis

preprint
submitted on 07.05.2020 and posted on 08.05.2020 by Paul Clabaut, Ruben Staub, Joachim Galiana, Elise Antonetti, Stephan Steinmann
Water molecules adsorbed on noble metal surfaces are of fundamental interest in surface science, heterogeneous catalysis and as a model for the metal/water interface. Herein, we analyse 27 water structures adsorbed on five noble metal surfaces (Cu, Ag, Au, Pd, Pt) via density functional theory and energy decomposition analysis based on the block localized wave function technique. The structures, ranging from the monomers to ice adlayers, reveal that the charge-transfer from water to the surface is nearly independent from the charge-transfer between the water molecules, while the polarization energies are cooperative. Dense water-water networks with small surface dipoles, such as the sqrt(39) x sqrt(39) unit cell (experimentally observed on Pt(111) ) are favored compared to the highly ordered and popular Hup and Hdown phases. The second main result of our study is that the many-body interactions, which stabilize the water assemblies on the metal surfaces, are dominated by the polarization energies, with the charge-transfer scaling with the polarization energies. Hence, if an empirical model could be found that reproduces the polarization energies, the charge-transfer could be predicted as well, opening exciting perspectives for force field development.

History

Email Address of Submitting Author

stephan.steinmann@ens-lyon.fr

Institution

ENS de Lyon

Country

France

ORCID For Submitting Author

0000-0002-2777-356X

Declaration of Conflict of Interest

No conflict of interest

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