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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

67
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...
67
Processes at Electrodes01:30

Processes at Electrodes

16
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...
16
Electrochemical Systems01:24

Electrochemical Systems

41
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,...
41

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Related Experiment Video

Updated: Mar 6, 2026

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Diffuse Layer Effect on Electron-Transfer Kinetics Measured by Scanning Electrochemical Microscopy (SECM).

Je Hyun Bae1, Yun Yu1,2, Michael V Mirkin1,2

  • 1Department of Chemistry and Biochemistry, Queens College , Flushing, New York 11367, United States.

The Journal of Physical Chemistry Letters
|March 14, 2017
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Summary

The electrical double layer (EDL) significantly impacts electron transfer kinetics at nanoelectrodes. Correcting for EDL effects reveals rate constants independent of electrode separation, crucial for understanding nanoscale electrochemistry.

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Area of Science:

  • Electrochemistry
  • Nanotechnology
  • Physical Chemistry

Background:

  • The electrical double layer (EDL) influences mass transfer and electrochemical reactions at nanoscale interfaces.
  • EDL effects are pronounced in low conductivity media but can impact redox species kinetics even with high electrolyte concentrations.

Purpose of the Study:

  • To investigate the influence of the electrical double layer (EDL) on electron transfer kinetics at a platinum nanoelectrode.
  • To quantify the rate constant for Fe(CN)6(4-) oxidation and assess its dependence on electrode separation distance.

Main Methods:

  • Utilized scanning electrochemical microscopy (SECM) with a platinum nanoelectrode tip.
  • Measured cyclic voltammograms at varying tip-substrate separations in 1 M KCl.
  • Applied theoretical models with and without EDL correction for data analysis.

Main Results:

  • Apparent standard rate constants increased with decreasing tip-substrate separation when EDL effects were not corrected.
  • Fitting voltammograms to theory incorporating EDL effects yielded rate constants largely independent of separation distance.

Conclusions:

  • The electrical double layer significantly affects measured electron transfer kinetics at nanoelectrodes.
  • Accurate electrochemical analysis at the nanoscale requires explicit consideration of EDL phenomena for reliable rate constant determination.