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Voltammetric Techniques: Cyclic Voltammetry

Voltammetric Techniques: Cyclic Voltammetry

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...

Voltammetric Techniques: Linear-Scan (E vs Time)

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...

Voltammetry: Overview

Voltammetry: Overview

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...

Voltammetry: Stripping Methods

Voltammetry: Stripping Methods

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...

Voltammetric Techniques: Pulse Voltammetry

Voltammetric Techniques: Pulse Voltammetry

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...

Voltammetry: Factors Affecting Measurements

Voltammetry: Factors Affecting Measurements

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...

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Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

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Published on: June 30, 2019

Cyclic Voltammetry at Shallow Recessed Microdisc Electrode: Theoretical and Experimental Study.

Jidong Guo¹, Ernő Lindner

¹Department of Biomedical Engineering, University of Memphis 330 Engineering Technology, Memphis, TN 38152, USA.

Journal of Electroanalytical Chemistry (Lausanne, Switzerland)

|February 18, 2010

Summary

This study examines cyclic voltammetry at recessed microdisc electrodes, revealing how recess depth influences the transition from Cottrellian to steady-state diffusion. The findings provide a new dimensionless parameter for analyzing electrochemical behavior.

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Area of Science:

Electrochemistry
Analytical Chemistry

Background:

Microelectrode arrays are crucial in electrochemical analysis.
Understanding diffusion behavior at recessed electrodes is key for sensor development.

Purpose of the Study:

To investigate the transition from Cottrellian to steady-state diffusion at shallow recessed microdisc electrodes.
To analyze the effect of electrode recess depth on diffusion behavior.
To define and determine a dimensionless transition scan rate.

Main Methods:

Simulations of diffusion to inlaid and recessed microdisc electrodes.
Analysis of cyclic voltammetry (CV) curve shapes.
Fitting simulated CVs with experimental data.

Main Results:

The transition time from planar to hemispherical diffusion shows a minimum with increasing recess depth.
Theoretical predictions align with experimental observations.
A dimensionless transition scan rate was defined and determined for various electrode geometries.

Conclusions:

Electrode recess significantly impacts diffusion characteristics in cyclic voltammetry.
The defined dimensionless transition scan rate offers a valuable metric for characterizing microelectrode behavior.
This research enhances the understanding of electrochemical processes at complex electrode geometries.