The structure of water at a Pt(111) electrode and the potential of zero charge studied from first principles.
J Chem Phys
; 144(19): 194701, 2016 May 21.
Article
en En
| MEDLINE
| ID: mdl-27208959
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 5.01 V is derived, giving a potential of zero charge of Pt(111) of 0.57 V 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.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
J Chem Phys
Año:
2016
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Estados Unidos