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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...

Potentiometry: Overview

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...

The Electrical Double Layer

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...

Standard Electrode Potentials

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...

Junction Potentials in Galvanic Cells

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...

Potentiometry: Types of Electrodes

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...

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Updated: Jun 22, 2026

AC Electrokinetic Phenomena Generated by Microelectrode Structures

AC Electrokinetic Phenomena Generated by Microelectrode Structures

Published on: July 28, 2008

Sonopotential: a new concept in electrochemistry.

Elena Marchante¹, Teresa Lana-Villarreal, Verónica Sáez

¹Institut Universitari d'Electroquímica i Departament de Química Física, Universitat d'Alacant, E-03080, Alacant, Spain.

Chemical Communications (Cambridge, England)

|July 2, 2009

Summary

Ultrasound applied to semiconductor electrodes generates a sonopotential. This potential change is sensitive to ultrasonic power and the solution

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Area of Science:

Electrochemistry
Physical Chemistry
Materials Science

Background:

Semiconductor electrodes are crucial in various electrochemical applications.
Understanding potential changes at electrode-solution interfaces is fundamental.
The effect of external stimuli like ultrasound on electrochemical systems is an area of interest.

Purpose of the Study:

To investigate the impact of ultrasound on the open circuit potential of semiconductor electrodes.
To characterize the phenomenon of sonopotential generation.
To determine the factors influencing the sonopotential.

Main Methods:

Application of ultrasound to a semiconductor electrode immersed in a solution.
Measurement of the open circuit potential changes.
Varying ultrasonic power and solution composition to observe effects.

Main Results:

Ultrasound application induces a measurable change in the open circuit potential.
This potential change, termed sonopotential, is observed at the semiconductor electrode.
The sonopotential magnitude is dependent on both the applied ultrasonic power and the specific composition of the solution.

Conclusions:

Ultrasound can significantly alter the electrochemical potential at semiconductor electrode-solution interfaces.
The sonopotential effect offers a new method for probing solution composition using electrochemical techniques.
This finding has implications for sonoelectrochemistry and sensor development.