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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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Cork-Derived Carbon Sheets for High-Performance Na-Ion Capacitors.

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Sustainable S-doped carbon sheets from cork offer high sodium storage capacities and energy density. These advanced materials enable efficient sodium-ion capacitors with excellent cycling stability for energy storage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Developing advanced carbon materials for energy storage is crucial.
  • Sustainable and cost-effective precursors are needed for large-scale applications.
  • Sulfur doping can enhance the electrochemical performance of carbon materials.

Purpose of the Study:

  • To prepare sulfur-doped carbon sheets from renewable biomass (cork).
  • To investigate the sodium storage performance of these S-doped carbon sheets.
  • To develop and test a sodium-ion capacitor using S-doped and porous carbon sheets.

Main Methods:

  • Mild ball-milling of cork to deconstruct its 3D structure.
  • Sulfur doping using an earth-abundant sulfur source (>14 wt% S).
  • Chemical activation to produce highly porous carbon sheets (SBET > 2700 m²/g).

Main Results:

  • S-doped carbon sheets exhibit high Na storage capacities (300-550 mAh/g at 0.1 A/g) and good volumetric capacities.
  • Materials handle high current densities (55-140 mAh/g at 10 A/g).
  • A sodium-ion capacitor achieved high energy/power (90 Wh/kg at 29 kW/kg) with robust cycling (>10,000 cycles, 0.0018% fade/cycle).

Conclusions:

  • Sustainable S-doped carbon sheets from cork are promising anode materials for sodium-ion batteries.
  • Porous carbon sheets enhance anion storage and capacitor performance.
  • The developed sodium-ion capacitor demonstrates excellent energy density, power density, and cycling stability.