Related Experiment Video
Updated: May 6, 2026
11:44
Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
Published on: October 18, 2018
27.4K
Direct separation of faradaic and double layer charging current in potential step voltammetry
Jiarun Tu1, Wensheng Cai, Xueguang Shao
1State Key Laboratory of Medicinal Chemical Biology, and Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
Talanta
|October 24, 2013
Summary
This study introduces a new method using iterative target transformation factor analysis (ITTFA) to separate electrochemical double layer charging current from faradaic current. This enhances accurate measurement and improves sensitivity in voltammetry.
Area of Science:
- Electrochemistry
- Analytical Chemistry
Background:
- Double layer charging current interferes with accurate faradaic current measurement in electrochemical systems.
- Separating these currents is crucial for precise quantitative analysis.
Purpose of the Study:
- To develop a method for directly extracting both faradaic and double layer charging currents from potential step voltammetry signals.
- To improve the accuracy and sensitivity of electrochemical measurements.
Main Methods:
- Iterative Target Transformation Factor Analysis (ITTFA) was employed.
- Initial target vectors based on theoretical current formulae were constructed.
- Iterative transformation calculated the weights of faradaic and charging currents in the measured signal.
Main Results:
- The method successfully separated faradaic and double layer charging currents without assumptions.
- Analyzed voltammograms of potassium ferricyanide, copper sulfate, and paracetamol showed ideal sigmoid shapes.
- Signal intensity was significantly enhanced, with improved baseline and plateau characteristics.
Conclusions:
- The developed ITTFA method provides a novel approach for measuring pure faradaic current in potential step voltammetry.
- This technique offers a potential alternative for enhancing the sensitivity of quantitative electrochemical analysis.
Related Concept Videos
01:21Voltammetry: Factors Affecting Measurements
760
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...
760
01:30The Electrical Double Layer
253
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...
253
01:17Voltammetric Techniques: Pulse Voltammetry
2.8K
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...
2.8K
01:12Voltammetric Techniques: Linear-Scan (E vs Time)
2.4K
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...
2.4K
01:13Voltammetry: Stripping Methods
1.3K
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...
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...
1.3K
01:17Controlled-Potential Coulometry: Electrolytic Methods
922
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.
The chosen potential...
The chosen potential...
922