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Related Concept Videos

Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

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Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
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Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
147
Voltammetry: Overview01:20

Voltammetry: Overview

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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
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Controlled-Current Coulometry: Overview01:27

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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...
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Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
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Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

466
Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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Genuine anodic and cathodic current components in cyclic voltammetry.

Valentin Mirceski1,2,3, Dariusz Guziejewski4, Rubin Gulaboski5

  • 1Department of Instrumental Analysis, University of Lodz, Pomorska 163, 90-236, Łódź, Poland. valentin.mircheski@chemia.uni.lodz.pl.

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This study introduces a mathematical model to separate anodic and cathodic currents in electrochemical reactions. This method provides new insights into electrode kinetics for fast processes.

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Area of Science:

  • Electrochemistry
  • Chemical Kinetics

Background:

  • Cyclic voltammetry is a common technique for studying electrode reactions.
  • Analyzing complex electrode reactions, especially fast ones, can be challenging.
  • Current separation into anodic and cathodic components is crucial for kinetic analysis.

Purpose of the Study:

  • To develop a mathematical model for accurately estimating implicit anodic and cathodic current components.
  • To provide direct insight into electrode kinetics using Butler-Volmer kinetics.
  • To enable the kinetic characterization of fast electrode processes.

Main Methods:

  • Utilizing basic mathematical modeling within Butler-Volmer electrode kinetics.
  • Transforming conventional cyclic voltammograms.
  • Requiring only the formal potential of the redox couple as input.

Main Results:

  • Accurate estimation of real anodic and cathodic current components from net current.
  • Successful replacement of net current with distinct anodic and cathodic components.
  • Demonstration of the method's efficacy using the hexaammineruthenium(III) reduction.

Conclusions:

  • The proposed methodology offers a novel perspective for analyzing voltammetric data.
  • It enables the kinetic characterization of fast, seemingly reversible electrode processes.
  • This approach is valuable for studying complex electrochemical systems.