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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Capacitor With A Dielectric01:18

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Capacitor in an AC Circuit01:23

Capacitor in an AC Circuit

A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
Consider a purely capacitive circuit consisting...
Capacitors01:15

Capacitors

Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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RC Circuits: Charging A Capacitor01:30

RC Circuits: Charging A Capacitor

A circuit containing resistance and capacitance is called an RC circuit. A capacitor is an electrical component that stores electric charge by storing energy in an electric field. Consider a simple RC circuit having a DC (direct current) voltage source ε, a resistor R, a capacitor C, and a two-way position switch. In the circuit, the capacitor can be charged or discharged depending on the position of the switch.
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MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Published on: January 7, 2022

Thermodynamic cycle analysis for capacitive deionization.

P M Biesheuvel1

  • 1Department of Environmental Technology, Wageningen University, Bomenweg 2, 6703 HD Wageningen, The Netherlands. maarten.biesheuvel@wur.nl

Journal of Colloid and Interface Science
|January 27, 2009
PubMed
Summary
This summary is machine-generated.

Capacitive deionization (CDI) models minimum energy for ion separation. This thermodynamic analysis optimizes the reversible charging-discharging cycle for efficient water desalination.

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Area of Science:

  • Thermodynamics
  • Electrochemistry
  • Water Treatment

Background:

  • Capacitive deionization (CDI) removes ions using electrode polarization.
  • Understanding the thermodynamic limits of CDI is crucial for energy efficiency.

Purpose of the Study:

  • To develop a thermodynamic model for minimum work in CDI ion separation.
  • To analyze the reversible charging-discharging cycle using the Gouy-Chapman-Stern (GCS) model.

Main Methods:

  • Describing ionic solutions as ideal pointlike particles.
  • Applying the GCS model for planar diffuse polarization layers.
  • Analyzing electric work input/output and charge-voltage relations.

Main Results:

  • The model quantifies minimum work for ion separation in a reversible CDI cycle.
  • Graphical analysis illustrates net work input based on ionic strength.
  • An analytical solution for charge efficiency (Lambda) was derived.

Conclusions:

  • The thermodynamic model provides insights into CDI energy requirements.
  • Charge efficiency approaches unity only at high voltage and infinite Stern layer capacity.
  • This work contributes to optimizing CDI for efficient water desalination.