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Related Concept Videos

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...
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...
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...
Electrolysis03:00

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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...

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Related Experiment Video

Updated: Jun 25, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

Steady state oxygen reduction and cyclic voltammetry.

Jan Rossmeisl1, Gustav S Karlberg, Thomas Jaramillo

  • 1Center for Atomic-scale Materials Design, Department of Physics, Technical University of Denmark, Lyngby DK-2800, Denmark.

Faraday Discussions
|February 14, 2009
PubMed
Summary
This summary is machine-generated.

This study uses density functional calculations to model the oxygen reduction reaction (ORR) on Pt and Pt3Ni. The findings reveal that optimal catalytic activity depends on intermediate hydroxyl binding, guiding future catalyst design.

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • The oxygen reduction reaction (ORR) is crucial for fuel cell technology.
  • Platinum-based catalysts are widely used but their activity is limited.
  • Understanding the ORR mechanism at the atomic level is essential for catalyst improvement.

Purpose of the Study:

  • To investigate the catalytic activity of Pt and Pt3Ni for the ORR using theoretical models.
  • To elucidate the role of adsorbed hydroxyl (OH) species in ORR activity.
  • To compare theoretical predictions with experimental cyclic voltammetry data.

Main Methods:

  • Density functional calculations (DFT) were employed to develop a Sabatier model.
  • A simple kinetic model for ORR was developed to analyze kinetic effects.
  • Theoretical cyclic voltammetry was compared with experimental results under varying oxygen conditions.

Main Results:

  • The Sabatier model accurately predicts potential-dependent OH coverage and current densities.
  • The model provides atomic-level insights into the ORR mechanism.
  • Kinetic modeling revealed a first-order dependence on oxygen pressure near the volcano top.

Conclusions:

  • Intermediate binding of OH species is key for maximum catalytic activity.
  • Platinum (Pt) catalysts are limited by strong OH binding.
  • Platinum-3Nickel (Pt3Ni) catalysts are limited by weak OH binding, suggesting opportunities for optimization.