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The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Rapid in-silico Battery Electrolyte Electrochemical Reaction Generation using 3T-VASP Multi-Scale Energy Minimization
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Electronic structure calculations in electrolyte solutions: Methods for neutralization of extended charged

Arihant Bhandari1, Lucian Anton2, Jacek Dziedzic1

  • 1School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.

The Journal of Chemical Physics
|October 2, 2020
PubMed
Summary

We developed a new method, Neutralization by Electrolyte Concentration Shift (NECS), to accurately simulate charged materials in periodic boundary conditions. This approach mimics real-world electrolyte screening, improving simulation accuracy for materials science.

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Area of Science:

  • Computational materials science
  • Physical chemistry
  • Condensed matter physics

Background:

  • Density functional theory (DFT) with periodic boundary conditions (PBCs) is crucial for simulating extended materials.
  • Standard methods impose artificial electroneutrality using a uniform background charge (jellium), which doesn't reflect real-world screening mechanisms.
  • Electrolyte screening in systems like charged electrodes is a more realistic neutralization process.

Purpose of the Study:

  • To develop a physically optimal method for imposing electroneutrality in DFT simulations of charged materials within PBCs.
  • To accurately model the screening effect of surrounding electrolytes, mimicking experimental conditions.
  • To implement and compare new neutralization schemes within a linear-scaling DFT code.

Main Methods:

  • Hybrid quantum-continuum modeling using a modified Poisson-Boltzmann equation.
  • Introducing the Neutralization by Electrolyte Concentration Shift (NECS) principle, minimizing electrolyte ion concentration deviations from open boundary conditions (OBCs).
  • Implementation in the ONETEP DFT code with a parallel Poisson-Boltzmann solver (DL_MG).
  • Development of a simplified 'accessible jellium' neutralization scheme.

Main Results:

  • The NECS approach ensures simultaneous electroneutrality in the simulation cell and bulk electrolyte, matching experimental observations.
  • NECS accurately reproduces electrolyte ion concentration profiles, unlike traditional jellium methods.
  • Demonstration and comparison of NECS and 'accessible jellium' on various examples.

Conclusions:

  • NECS provides a physically grounded and accurate method for handling charged systems in DFT simulations under PBCs.
  • This method bridges the gap between theoretical simulations and experimental observations of electrolyte-influenced materials.
  • The developed schemes enhance the capability of DFT codes like ONETEP for simulating complex electrochemical interfaces.