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Related Concept Videos

MOS Capacitor01:25

MOS 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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Capacitor With A Dielectric01:18

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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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Energy Stored in a Capacitor01:12

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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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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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Interlayer Nano-Dots Induced High-Rate Supercapacitors.

Chunyan Li1,2, Xinkun Wang1, Dongge Ma3

  • 1Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, 212013, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 5, 2023
PubMed
Summary
This summary is machine-generated.

Introducing cadmium sulfide (CdS) nano-dots into layered double hydroxide (LDH) interlayers significantly boosts supercapacitor performance. This method enhances ion diffusion and electrochemical activity for superior charge storage efficiency in energy devices.

Keywords:
CdS nano-dotsinterlayer redox reactionlayer spacing regulationlayered double hydroxidessupercapacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Fast hydroxide ion (OH-) transfer is crucial for efficient charge storage in layered double hydroxide (LDH)-based supercapacitors (SCs).
  • Creating reactive sites within LDH interlayers is a significant challenge for improving SC performance.

Purpose of the Study:

  • To enhance the charge storage efficiency of NiFe-LDH based supercapacitors by introducing CdS nano-dots (NDs) into the interlayers.
  • To investigate the impact of interlayer CdS NDs on ion diffusion, electrochemical activity, and overall performance compared to surface-modified LDH.

Main Methods:

  • Synthesized ultra-thin NiFe-LDH and incorporated CdS nano-dots into its interlayers (CdSinter.-NiFe-LDH).
  • Characterized the structural and electrochemical properties of the modified LDH.
  • Fabricated supercapacitor devices using the modified LDH electrodes.

Main Results:

  • Interlayer CdS NDs enlarged the layer spacing to 0.81 nm and improved the OH- diffusion coefficient to 1.6 × 10-8 cm2 s-1.
  • CdSinter.-NiFe-LDH exhibited a higher electrochemical active area (601 mF cm-2) and capacitance (3330.0 F g-1 at 1 A g-1) compared to surface-modified LDH.
  • The assembled asymmetric SC device achieved an energy density of 121.56 Wh kg-1 and a power density of 754.5 W kg-1.

Conclusions:

  • Introducing CdS nano-dots into the interlayers of NiFe-LDH is an effective strategy to enhance ion transport and electrochemical activity for high-performance supercapacitors.
  • The CdSinter.-NiFe-LDH material demonstrates superior electrochemical performance, including high capacitance and excellent energy/power density, making it promising for next-generation energy storage solutions.