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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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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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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.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Graphene-based nanowire supercapacitors.

Zhi Chen1, Dingshan Yu, Wei Xiong

  • 1Institute of Advanced Materials for Nano-bio Applications, School of Ophthalmology and Optometry, Wenzhou Medical University , 270 Xueyuan Xi Road, Wenzhou, Zhejiang Province 325027, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 5, 2014
PubMed
Summary
This summary is machine-generated.

We developed novel graphene oxide/polypyrrole nanowire supercapacitors, achieving high capacitance and stability. Further modifications yielded reduced graphene oxide/carbon nanowires with enhanced thermal stability and energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Electrochemical supercapacitors are crucial energy storage devices.
  • Graphene oxide and polypyrrole are promising materials for supercapacitor electrodes.
  • Developing high-performance and stable supercapacitors remains an active research area.

Purpose of the Study:

  • To synthesize and characterize novel graphene oxide/polypyrrole nanowire-based supercapacitors.
  • To investigate the electrochemical performance and stability of these supercapacitors.
  • To enhance thermal stability and long-term charge storage through material modification.

Main Methods:

  • Electrodeposition of graphene oxide/polypyrrole composite into an Al2O3 template.
  • Template removal to form vertically aligned nanowires.
  • Electrochemical doping and subsequent thermal carbonization for material enhancement.

Main Results:

  • Graphene oxide/polypyrrole nanowires achieved a high capacitance of 960 F g(-1).
  • The supercapacitors demonstrated stable performance over 300 charge/discharge cycles.
  • Reduced graphene oxide/carbon nanowires exhibited a capacitance of 200 F g(-1) with improved thermal stability and lower Faraday resistance.

Conclusions:

  • Vertically aligned graphene oxide/polypyrrole nanowires offer excellent capacitive performance due to large surface area and good electrode contact.
  • Electrochemical reduction and thermal carbonization enhance the thermal stability and long-term charge storage of graphene-based supercapacitors.
  • The developed reduced graphene oxide/carbon nanowire supercapacitors outperform conventional porous carbon materials.