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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.
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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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Energy Stored in Capacitors01:10

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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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A flexible all-solid-state supercapacitor based on carbon-supported Ni-embedded boron nitride.

Shrabani De1, Binod Raj Kc1, Gayani Pathiraja2

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Researchers transformed toxic cigarette filters into a low-cost carbon source for advanced energy storage. This innovation created a flexible supercapacitor with high performance and durability, offering a novel waste management solution.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Science

Background:

  • Hazardous waste materials like cigarette filters pose environmental challenges.
  • Developing sustainable and low-cost electrode materials for energy storage is crucial.

Purpose of the Study:

  • To investigate the use of cigarette filter-derived carbon combined with nickel-embedded boron nitride (Ni-BN) for flexible supercapacitors.
  • To create an efficient and environmentally friendly energy storage solution from waste materials.

Main Methods:

  • Synthesized Ni-embedded boron nitride (BN) nanosheets.
  • Derived carbon from waste cigarette filters to form a composite with Ni-BN.
  • Fabricated a flexible all-solid-state asymmetric supercapacitor using the composite material.

Main Results:

  • The Ni-BN/carbon composite electrode exhibited enhanced electrochemical properties due to restricted layer stacking and improved electron transfer.
  • The fabricated supercapacitor demonstrated excellent flexibility (250 bending cycles), high specific capacitance (47 F g⁻¹), and good energy/power densities (7.9 Wh kg⁻¹).
  • The device maintained 86% capacitance after 10,000 cycles and successfully powered an LED, indicating real-world applicability.

Conclusions:

  • Waste cigarette filters can be repurposed into valuable carbon materials for high-performance energy storage.
  • The developed Ni-embedded boron nitride/carbon composite offers a sustainable approach for flexible supercapacitor fabrication.
  • This research presents a promising waste management strategy for creating advanced energy storage devices.