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Related Concept Videos

Equivalent Capacitance01:19

Equivalent Capacitance

From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
Equivalent Capacitance01:19

Equivalent Capacitance

Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
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...
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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Capacitors and Capacitance01:18

Capacitors and Capacitance

A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

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Related Experiment Video

Updated: Jul 14, 2026

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

Published on: January 7, 2022

Tuning Zn-ZIF Derivatives via Dual-Anion Hybridization for High-Performance Supercapacitors.

Zishuo Shi1, Yining Wang1, Yue Song1

  • 1School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2026
PubMed
Summary

Researchers developed a novel ZnS/ZnSe-MXene composite for energy storage. This advanced material shows high capacitance and excellent stability, making it promising for next-generation supercapacitors.

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Related Experiment Videos

Last Updated: Jul 14, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transition metal sulfur compounds offer unique electronic structures and polymorphic characteristics for energy conversion and storage.
  • Monovalent and binary transition metal sulfur/selenium compounds are less complex, allowing for easier property optimization via compositional and microstructural tuning.

Purpose of the Study:

  • To synthesize a multiphase ZnS/ZnSe-MXene heterogeneous composite hybrid material.
  • To evaluate the electrochemical performance of the synthesized material as an electrode for supercapacitors.

Main Methods:

  • A two-step hydrothermal route was employed using ZIF-7 as a precursor.
  • Characterization of the resulting material's porous structure and specific surface area.
  • Electrochemical testing using a three-electrode setup and assembly of an asymmetric supercapacitor.

Main Results:

  • The ZnS/ZnSe@MXene material exhibited a high gravimetric specific capacitance of 1047.2 F g⁻¹ at 1 A g⁻¹.
  • The electrode demonstrated excellent cycling stability, retaining 88.78% capacitance after 10,000 cycles at 10 A g⁻¹.
  • An asymmetric supercapacitor achieved an energy density of 15.5 Wh kg⁻¹ at a power density of 750 W kg⁻¹.

Conclusions:

  • The synthesized ZnS/ZnSe@MXene hybrid material possesses an optimized porous structure facilitating electrolyte penetration and redox-active site exposure.
  • This material shows significant potential as an electrode for advanced energy storage systems.
  • The study highlights the viability of using such composites in high-performance supercapacitors.