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Related Concept Videos

Electrodes: Overview01:17

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
The Electrical Double Layer01:30

The Electrical Double Layer

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...
Processes at Electrodes01:30

Processes at Electrodes

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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Related Experiment Video

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Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance
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Uncompensated resistance. 2. The effect of reference electrode nonideality

Oldham1, Stevens

  • 1Department of Chemistry, Trent University, Peterborough, Ontario, Canada.

Analytical Chemistry
|September 20, 2000
PubMed
Summary

This study simulates how reference electrode size affects uncompensated resistance (U) in electrochemical systems. Optimal Luggin probe size is crucial to minimize current reduction and maintain accurate measurements.

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Area of Science:

  • Electrochemistry
  • Computational Science
  • Electrochemical Engineering

Background:

  • Uncompensated resistance (U) is a critical parameter in electrochemical measurements.
  • Accurate electrochemical analysis requires minimizing U.
  • The geometry of the reference electrode system significantly influences U.

Purpose of the Study:

  • To investigate the impact of reference electrode size and position on uncompensated resistance (U).
  • To analyze the interplay between reference electrode geometry and current distribution near the working electrode.
  • To provide guidelines for minimizing measurement errors caused by reference electrode intrusion.

Main Methods:

  • Finite-element simulation of electrochemical systems.
  • Modeling of an idealized reference electrode as a conducting disk in an insulator.
  • Analysis of current flow patterns and resistance variations with changing electrode dimensions and gaps.

Main Results:

  • Uncompensated resistance (U) decreases as the reference electrode approaches the working electrode.
  • A 'backwater effect' reduces U by diverting current lines away from the Luggin probe.
  • A 'short-circuiting effect' enhances U when current lines pass through the reference electrode.
  • Finite reference electrode size can reduce total current and perturb current density distribution.

Conclusions:

  • Decreasing the working-to-reference gap indefinitely reduces U.
  • Luggin probe diameter should not exceed one-fourth of the working electrode diameter to avoid significant shielding.
  • Careful consideration of reference electrode geometry is essential for accurate electrochemical measurements.