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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

1.4K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

5.5K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

436
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...
436
Electrodes: Overview01:17

Electrodes: Overview

2.2K
 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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Carbon-Based Capacitive Deionization Electrodes: Development Techniques and its Influence on Electrode Properties.

Anne Therese Angeles1, Jaeyoung Lee1,2

  • 1Electrochemical Reaction and Technology Laboratory (ERTL), School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, South Korea.

Chemical Record (New York, N.Y.)
|March 1, 2021
PubMed
Summary
This summary is machine-generated.

Capacitive deionization (CDI) offers cost-effective water treatment. This review details carbon electrode fabrication techniques for improved performance and scalability in CDI systems.

Keywords:
ERTLSouth Koreacapacitive deionizationcarboncarbon modification

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Engineering

Background:

  • Capacitive deionization (CDI) is a promising technology for energy-efficient water desalination and softening.
  • Developing high-performance and scalable CDI electrodes is crucial for practical application.
  • Carbon-based materials are extensively researched for CDI electrode fabrication due to their tunable properties.

Purpose of the Study:

  • To present various techniques for fabricating carbon-based CDI electrodes.
  • To analyze the impact of these fabrication methods on electrode surface and electrochemical properties.
  • To identify research gaps and future prospects in CDI electrode development.

Main Methods:

  • Review of fabrication techniques for carbon-based CDI electrodes.
  • Analysis of surface and electrochemical properties of modified carbon materials.
  • Compilation of studies from leading research institutions and recent literature.

Main Results:

  • Different carbon material synthesis and modification strategies significantly influence CDI performance.
  • Surface area, porosity, and conductivity are key factors affected by fabrication techniques.
  • Optimized electrode properties correlate with enhanced desalination and water softening efficiency.

Conclusions:

  • Fabrication techniques play a critical role in tailoring carbon electrode properties for advanced CDI.
  • Further research is needed to bridge current gaps in scalable and high-performance CDI electrode design.
  • This review aims to stimulate further interest and innovation in capacitive deionization technology.