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Evaluating Adsorbate-Solvent Interactions: Are Dispersion Corrections Necessary?

Eleonora Romeo1, Francesc Illas1, Federico Calle-Vallejo2,3

  • 1Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain.

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Summary
This summary is machine-generated.

Accurately modeling aqueous reactions requires accounting for solvent effects. A new microsolvation method efficiently models solvation shells for adsorbates on metal surfaces, balancing accuracy and computational cost.

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Area of Science:

  • Computational chemistry
  • Surface science
  • Electrochemistry

Background:

  • Accurate modeling of aqueous (electro)catalytic reactions necessitates inclusion of solvent-adsorbate interactions.
  • Existing methods for incorporating these interactions are often computationally expensive or lack precision.

Purpose of the Study:

  • To develop and assess an efficient microsolvation method for modeling solvation shells around adsorbates on transition-metal surfaces.
  • To evaluate the computational cost and accuracy trade-offs of this approach.

Main Methods:

  • A microsolvation approach was employed to define and analyze the first solvation shell of adsorbed species.
  • Solvation energies were calculated for adsorbates on transition-metal surfaces.
  • The necessity of dispersion corrections was investigated.

Main Results:

  • The proposed microsolvation method provides a computationally efficient way to model solvation shells.
  • Dispersion corrections were found to be generally unnecessary for this model.
  • Care must be taken when water-water and water-adsorbate interactions are of comparable strength.

Conclusions:

  • Microsolvation offers a viable strategy for balancing accuracy and computational expense in modeling aqueous catalytic systems.
  • The developed method streamlines the analysis of solvation effects in surface chemistry.