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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

884
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...
884

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Reactant conversion-intercalation strategy toward interlayer-expanded MoS2 microflowers with superior supercapacitor

Jingwei Wang1, Xuejun Zheng1, Yaoyong Dong1

  • 1School of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China. zhengxuejun@xtu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|March 15, 2023
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Summary

A new method synthesizes interlayer-expanded molybdenum disulfide (E-MoS2) using a simple reactant conversion-intercalation strategy. This E-MoS2 shows significantly improved supercapacitor performance compared to pristine MoS2.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Conventional synthesis of layered materials like molybdenum disulfide (MoS2) often involves complex procedures and external templates.
  • There is a need for simplified strategies to engineer the interlayer spacing of MoS2 for enhanced electrochemical applications.

Purpose of the Study:

  • To develop a facile reactant conversion-intercalation strategy for synthesizing interlayer-expanded MoS2 (E-MoS2).
  • To investigate the supercapacitor performance of the synthesized E-MoS2.
  • To understand the mechanism behind the enhanced electrochemical properties through theoretical calculations.

Main Methods:

  • Employed a reactant conversion-intercalation strategy using thiourea as both reactant and intercalator precursor.
  • Synthesized E-MoS2 by converting thiourea to ammonium thiocyanate for in situ intercalation.
  • Evaluated supercapacitor performance using three-electrode and symmetric supercapacitor systems.
  • Conducted density functional theory (DFT) calculations to analyze structural and electronic properties.

Main Results:

  • Synthesized E-MoS2 with an expanded interlayer spacing of 9.4 Å.
  • E-MoS2 electrodes exhibited a specific capacity of 246.8 F g-1 at 0.5 A g-1, significantly outperforming pristine MoS2 (42.5 F g-1).
  • A symmetric supercapacitor using E-MoS2 achieved a high specific capacity of 261.3 F g-1, energy density of 13.3 W h kg-1, and 81.7% capacity retention after 3000 cycles.
  • DFT calculations confirmed effective NH4+ and SCN- intercalation, leading to enhanced Na+ adsorption and low diffusion barriers.

Conclusions:

  • The developed reactant conversion-intercalation strategy provides a simple and effective route to synthesize E-MoS2.
  • E-MoS2 demonstrates superior electrochemical performance for supercapacitor applications due to expanded interlayer spacing and favorable ion adsorption/diffusion.
  • This strategy offers a promising approach for interface engineering of layered materials for advanced energy storage.