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Related Concept Videos

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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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Electrochemistry: Overview01:04

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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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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Modeling Interfacial Dynamics on Single Atom Electrocatalysts: Explicit Solvation and Potential Dependence.

Zisheng Zhang1, Jun Li2, Yang-Gang Wang

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States.

Accounts of Chemical Research
|January 3, 2024
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Summary
This summary is machine-generated.

Single atom electrocatalysts are complex, with interfacial dynamics significantly impacting their performance. Realistic modeling is crucial for understanding and optimizing these noble metal-free catalysts for energy and environmental applications.

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Area of Science:

  • Electrocatalysis
  • Materials Science
  • Physical Chemistry

Background:

  • Single atom electrocatalysts (SAECs) are vital for energy and environmental applications due to their high atom efficiency and reactivity.
  • Their simple structure makes them ideal for studying reaction mechanisms, but their behavior under electrochemical conditions is complex.
  • Interfacial dynamics, including solvent and electrolyte ion interactions, significantly influence SAEC active sites.

Purpose of the Study:

  • To investigate the complex interfacial dynamics affecting single atom electrocatalysts during electrochemical reactions.
  • To demonstrate how electrochemical potential influences reaction pathways and intermediate stabilization.
  • To revise simplistic design principles for SAECs by incorporating interfacial factors.

Main Methods:

  • Analysis of popular single atom electrocatalysis systems.
  • Modeling of electrochemical potential effects on free energy profiles.
  • Investigation of solvation structures and interfacial phenomena.

Main Results:

  • Electrochemical potential induces significant variations in reaction free energy profiles.
  • Active center electronic structures dictate interfacial solvation, influencing reaction intermediates.
  • Solvation and polarization effects can favor alternative reaction pathways and dynamic site activation/deactivation.

Conclusions:

  • Realistic modeling including explicit solvent, electrolyte, and electrode potential is necessary for accurate understanding of SAEC mechanisms and trends.
  • Interfacial complexity offers opportunities for finer control and optimization of SAECs.
  • Current simplistic design principles need revision to account for kinetics and interfacial factors.