Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 144, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4948638
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Funding
- German Research Foundation (DFG) [GR 1503/21-2]
- Baden-Wurttemberg Foundation within the Network of Excellence Functional Nanostructures
- Baden-Wurttemberg government (MWK)
- German Research Foundation (DFG)
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The structure of a liquid water layer on Pt(111) has been studied by ab initio molecular dynamics simulations based on periodic density functional theory calculations. First the reliability of the chosen exchange-correlation function has been validated by considering water clusters, bulk ice structures, and bulk liquid water, confirming that the dispersion corrected RPBE-D3/zero functional is a suitable choice. The simulations at room temperature yield that a water layer that is six layers thick is sufficient to yield liquid water properties in the interior of the water film. Performing a statistical average along the trajectory, a mean work function of 5.01V is derived, giving a potential of zero charge of Pt(111) of 0.57V vs. standard hydrogen electrode, in good agreement with experiments. Therefore we propose the RPBE-D3/zero functional as the appropriate choice for first-principles calculations addressing electrochemical aqueous electrolyte/metal electrode interfaces. Published by AIP Publishing.
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