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Processes at Electrodes

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...

Controlled-Current Coulometry: Overview

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...

Amperometry: Overview

Amperometry: Overview

Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...

Interfacial Electrochemical Methods: Overview

Interfacial Electrochemical Methods: Overview

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 passing...

Coulometry: Overview

Coulometry: Overview

Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...

Potentiometry: Membrane Electrodes

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Related Experiment Video

Updated: May 30, 2026

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Published on: October 31, 2013

How to understand and interpret current flow in nanopore/electrode devices.

¹Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, UK. t.albrecht@imperial.ac.uk

|July 28, 2011

Summary

Three-electrode nanopore sensors offer advanced capabilities but can complicate characterization. Impedance modeling reveals how additional electrodes affect current distribution, providing guidelines for optimized sensor design and operation.

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Last Updated: May 30, 2026

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Monitoring Protein Adsorption with Solid-state Nanopores

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A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles

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Area of Science:

Analytical Chemistry
Nanotechnology
Biosensors

Background:

Nanopore-based single-molecule sensors are emerging analytical devices.
Three-electrode configurations are being explored for enhanced functionality, including DNA sequencing.

Purpose of the Study:

To investigate the impact of additional electrodes on current distribution and sensor performance in nanopore devices.
To provide guidelines for optimizing three-electrode nanopore sensor design and operation.

Main Methods:

Impedance modeling of a three-electrode nanopore sensor.
Simulation of current distribution under various experimental conditions.

Main Results:

The presence of a third electrode can significantly affect standard experimental device characterization.
Specific operating conditions can lead to complications in sensor performance analysis.

Conclusions:

Understanding electrode effects is crucial for accurate nanopore sensor characterization.
Simulations offer pathways to identify safe operating conditions and design optimized nanopore sensors.