Stripping away ion hydration shells in electrical double-layer formation: Water networks matter - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2021

Stripping away ion hydration shells in electrical double-layer formation: Water networks matter

Li Fu
Pascale Roy
  • Fonction : Auteur

Résumé

The double layer at the solid/electrolyte interface is a key concept in electrochemistry. Here, we present an experimental study combined with simulations, which provides a molecular picture of the double-layer formation under applied voltage. By THz spectroscopy we are able to follow the stripping away of the cation/anion hydration shells for an NaCl electrolyte at the Au surface when decreasing/increasing the bias potential. While Na + is attracted toward the electrode at the smallest applied negative potentials, stripping of the Cl − hydration shell is observed only at higher potential values. These phenomena are directly measured by THz spectroscopy with ultrabright synchrotron light as a source and rationalized by accompanying molecular dynamics simulations and electronic-structure calculations.
Fichier principal
Vignette du fichier
e2108568118.full.pdf (1.46 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Licence : CC BY - Paternité

Dates et versions

hal-03466567 , version 1 (06-12-2021)

Identifiants

Citer

Serena Alfarano, Simone Pezzotti, Christopher Stein, Zhou Lin, Federico Sebastiani, et al.. Stripping away ion hydration shells in electrical double-layer formation: Water networks matter. Proceedings of the National Academy of Sciences of the United States of America, 2021, 118 (47), pp.e2108568118. ⟨10.1073/pnas.2108568118⟩. ⟨hal-03466567⟩
34 Consultations
32 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More