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Related Concept Videos

Voltammetry: Stripping Methods01:13

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 Voltammetry01:17

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: Overview01:20

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...
Potentiometry: Membrane Electrodes01:15

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...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

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...
Voltammetric Techniques: Cyclic Voltammetry01:10

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...

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Related Experiment Video

Updated: May 21, 2026

Electrochemical Preparation of Poly(3,4-Ethylenedioxythiophene) Layers on Gold Microelectrodes for Uric Acid-Sensing Applications
10:48

Electrochemical Preparation of Poly(3,4-Ethylenedioxythiophene) Layers on Gold Microelectrodes for Uric Acid-Sensing Applications

Published on: July 28, 2021

Proton transfer voltammetry at electrodes modified with acid thiol monolayers.

Antonio M Luque1, Willem H Mulder, Juan José Calvente

  • 1Departamento de Química Física, Universidad de Sevilla , 41012-Sevilla, Spain.

Analytical Chemistry
|June 7, 2012
PubMed
Summary

Proton transfer voltammograms are simplified by modeling electrode potential and activation energy. Narrow peaks indicate acid groups must be near the electrode surface for efficient proton transfer.

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Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
08:32

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

Published on: June 30, 2019

Related Experiment Videos

Last Updated: May 21, 2026

Electrochemical Preparation of Poly(3,4-Ethylenedioxythiophene) Layers on Gold Microelectrodes for Uric Acid-Sensing Applications
10:48

Electrochemical Preparation of Poly(3,4-Ethylenedioxythiophene) Layers on Gold Microelectrodes for Uric Acid-Sensing Applications

Published on: July 28, 2021

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
08:32

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

Published on: June 30, 2019

Area of Science:

  • Electrochemistry
  • Surface Science
  • Physical Chemistry

Background:

  • Proton transfer at electrode surfaces is crucial for electrochemical reactions.
  • Understanding the factors influencing proton transfer kinetics is essential for designing efficient electrochemical systems.
  • Acid thiol monolayers on electrodes offer a model system to study interfacial proton transfer.

Purpose of the Study:

  • To derive a simplified expression for proton transfer voltammograms.
  • To investigate the influence of electrode potential and the location of acid groups on proton transfer.
  • To quantitatively analyze experimental voltammograms for insights into proton transfer mechanisms.

Main Methods:

  • Theoretical modeling combining electrode potential profiles with activation energy relationships.
  • Electrostatic analysis of proton transfer dynamics.
  • Quantitative fitting of experimental voltammograms using an Au(111) electrode modified with 11-mercaptoundecanoic acid.

Main Results:

  • A simple expression for proton transfer voltammograms was derived.
  • Proton transfer produces narrow voltammetric peaks only when acid groups are close to the metal substrate.
  • Less than 1% of carboxylic groups participated in potential-induced proton transfer, residing near the surface.

Conclusions:

  • The proximity of acid groups to the electrode surface is critical for narrow voltammetric peaks.
  • Interfacial electric fields can facilitate proton exchange even between non-contacting species.
  • Further kinetic analysis is needed to fully elucidate the proton transfer mechanism at interfaces.