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Related Concept Videos

Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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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.
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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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Hydroxyl-Functionalized Covalent Organic Frameworks as High-Performance Supercapacitors.

Tzu-Ling Yang1, Jhu-You Chen1, Shiao-Wei Kuo1

  • 1Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.

Polymers
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Novel hydroxy-functionalized covalent organic frameworks (COFs) demonstrate excellent performance as supercapacitor electrodes. These materials offer high surface areas and electrochemical activity for advanced energy storage applications.

Keywords:
Schiff-basecovalent organic frameworksdihydroxynaphthaleneredox-activesupercapacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are recognized for their unique properties like high surface areas and tunable architectures.
  • Their potential in energy applications is linked to heteroatom incorporation and redox-active units, enhancing electrochemical efficiency.

Purpose of the Study:

  • To synthesize and characterize novel hydroxy-functionalized COFs for supercapacitor applications.
  • To investigate the electrochemical performance of these COFs as electrode materials.

Main Methods:

  • Schiff-base polycondensation of 1,3,5-tris-(4-aminophenyl)triazine (TAPT-3NH2) with dihydroxynaphthalene dicarbaldehydes (2,3-NADC and 2,6-NADC).
  • Characterization of the synthesized COFs (TAPT-2,3-NA(OH)2 and TAPT-2,6-NA(OH)2) for surface area, crystallinity, and thermal stability.
  • Electrochemical testing of COFs as supercapacitor electrodes.

Main Results:

  • Two novel hydroxy-functionalized COFs were successfully synthesized with high BET surface areas (up to 1089 m²/g) and excellent thermal stability.
  • The COFs exhibited significant electrochemical redox activity, attributed to the integrated dihydroxynaphthalene units.
  • Supercapacitor electrodes made from these COFs achieved a specific capacitance of 271 F/g at 0.5 A/g with 86.5% capacitance retention after 2000 cycles.

Conclusions:

  • The synthesized hydroxy-functionalized COFs possess desirable properties for supercapacitor applications, including high surface area and electrochemical activity.
  • These COFs represent promising advanced electrode materials for practical energy storage devices.
  • The study highlights the potential of incorporating redox-active units into COF structures for enhanced electrochemical performance.