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Electrodeposition

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.
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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...

Electrogravimetric Analysis: Overview

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
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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...

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Related Experiment Video

Updated: Jul 4, 2026

Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells

Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells

Published on: February 1, 2016

Modeling electrowinning process in an expanded bed electrode.

R Thilakavathi¹, N Balasubramanian, C Ahmed Basha

¹Department of Chemical Engineering, Anna University, Chennai 600025, India.

Journal of Hazardous Materials

|June 20, 2008

Summary

A new theoretical model simulates metal electro winning in fluidized beds, showing particle size increases with electrolysis time. Model predictions align well with experimental data, validating its effectiveness for process optimization.

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Area of Science:

Electrochemistry
Fluidized Bed Reactors
Materials Science

Background:

Electro winning is crucial for metal recovery from dilute solutions.
Fluidized bed electrodes offer advantages in mass transfer and particle handling.
Understanding particle growth dynamics is key to optimizing electro winning processes.

Purpose of the Study:

To develop a theoretical model for the flow behavior of conducting particles in a fluidized bed electrode.
To analyze potential and current distributions, and mass transfer rates during electro winning.
To investigate the influence of operating parameters on particle growth.

Main Methods:

Development of a theoretical model incorporating fluid dynamics and electrochemical principles.
Formulation of model equations for potential, current, and mass transfer.
Simulation of particle growth under various operating conditions.
Comparison of model predictions with existing experimental data.

Main Results:

Particle size was observed to increase with electrolysis time.
The theoretical model successfully predicted particle growth trends.
Model simulations demonstrated satisfactory agreement with literature experimental findings.

Conclusions:

The developed theoretical model accurately describes particle behavior in fluidized bed electro winning.
The model provides a valuable tool for understanding and optimizing electro winning processes.
Findings confirm the relationship between electrolysis time and particle size increase.