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Related Concept Videos

Processes at Electrodes01:30

Processes at Electrodes

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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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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Electrochemical Systems01:24

Electrochemical Systems

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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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Electrolysis03:00

Electrolysis

31.4K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
31.4K
Electrochemistry: Overview01:04

Electrochemistry: Overview

4.1K
Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Advances in Computational Electrocatalysis: Modeling Reaction Kinetics in Realistic Electrochemical Environments.

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Computational electrocatalysis accurately predicts reaction kinetics using single-atom catalysts. This method captures interfacial phenomena for realistic simulations, offering insights for energy conversion catalyst design.

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Area of Science:

  • Computational electrochemistry and catalysis.
  • Methodological advancements in predicting reaction kinetics.

Background:

  • Computational methods in electrochemistry have rapidly advanced.
  • Accurate prediction of electrochemical reaction kinetics is crucial for catalyst design.

Purpose of the Study:

  • To review methodological progress in computational electrocatalysis.
  • To highlight contributions using single-atom catalysts for simulating kinetics.
  • To bridge the gap between idealized models and realistic electrochemical environments.

Main Methods:

  • Quantitative simulation of kinetics for energy-relevant small-molecule electrocatalytic reactions.
  • Utilizing single-atom catalysts as model systems.
  • Capturing atomic-scale interfacial phenomena in the electric double layer (cation effects, solvation, proton transfer, potential distribution).

Main Results:

  • Prediction of experimental observables like current density-potential curves and coverages.
  • Revealed insights into hydrogen-bond-mediated intermediate reorganization and its effect on transition states.
  • Identified potential-driven solvent reorganization impacting proton transfer kinetics.

Conclusions:

  • Advances provide fundamental kinetic insights into electrocatalytic mechanisms.
  • Offers practical design principles for developing efficient energy conversion catalysts.
  • The framework enables more realistic simulations of electrochemical environments.