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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Electrochemical Systems01:24

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Electrochemical phase formation: classical and atomistic theoretical models.

Alexander Milchev1

  • 1Evgeni Budevski Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 10, 1113 Sofia, Bulgaria. amilchev@gmail.com amilchev@ipc.bas.bg.

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Summary

This study explores electrochemical phase formation using classical and atomistic nucleation theories. It derives theoretical expressions and examines correlations between models and experimental data for nucleation and growth.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Electrochemical phase formation is crucial for materials synthesis and device performance.
  • Understanding nucleation and growth kinetics is essential for controlling material properties.
  • Existing theories provide frameworks but require refinement for specific electrochemical systems.

Purpose of the Study:

  • To analyze electrochemical phase formation under constant supersaturation.
  • To develop theoretical expressions for thermodynamic and kinetic quantities.
  • To correlate theoretical models with experimental observations.

Main Methods:

  • Application of classical nucleation theory.
  • Application of atomistic nucleation theory.
  • Derivation of general theoretical expressions for nucleation and growth parameters.

Main Results:

  • Theoretical expressions for key thermodynamic and kinetic quantities were derived.
  • The correlation between theoretical models and experimental results was discussed.
  • Progressive and instantaneous nucleation, along with cluster growth, were considered.

Conclusions:

  • The study provides a unified theoretical framework for electrochemical nucleation and growth.
  • It highlights the importance of integrating classical and atomistic approaches.
  • The findings facilitate better control over electrochemical synthesis of new phases.