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Ionization at a solid-water interface in an applied electric field: Charge regulation.

Ryuichi Okamoto1, Akira Onuki2

  • 1Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.

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We investigated ionization at solid-water interfaces under an electric field. Surface charge density regulates proton dissociation, with self-regulation observed for specific conditions, impacting interfacial charge screening.

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Area of Science:

  • Surface Chemistry
  • Electrochemistry
  • Physical Chemistry

Background:

  • Understanding ionization at solid-water interfaces is crucial for various applications, including electrocatalysis and biosensing.
  • The behavior of ions and surface charges at interfaces is influenced by applied electric fields and material properties.

Purpose of the Study:

  • To investigate the ionization process at a solid-water interface when an external electric field is applied.
  • To determine how surface charge density and solution properties affect the degree of dissociation at the interface.

Main Methods:

  • An electrode was attached to a dielectric film with silanol or carboxyl groups.
  • The degree of dissociation (α) was determined by the proton density in water near the film.
  • The study analyzed the dependence of α on NaOH density (n₀) and electrode surface charge density (σm), considering varying cell thicknesses (H).

Main Results:

  • For positive surface charge density (σm > 0), protons were expelled, increasing α.
  • Self-regulation of α was observed in the range 0 < σm < eΓ₀, approximating α ≅ σm/eΓ₀ under specific conditions.
  • Charge regulation showed a crossover at the Gouy-Chapman length when cell thickness (H) decreased below the Debye length (κ⁻¹), leading to partial ion screening and a nonvanishing interior electric field.

Conclusions:

  • Applied electric fields significantly influence ionization at solid-water interfaces.
  • Surface charge density and solution composition play critical roles in regulating interfacial dissociation.
  • Confinement effects at thicknesses below the Debye length alter charge screening mechanisms and interfacial electric fields.