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Related Experiment Video

Updated: Jun 1, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

High performance supercapacitors based on highly conductive nitrogen-doped graphene sheets.

Yongcai Qiu1, Xinfeng Zhang, Shihe Yang

  • 1Nano Science and Technology Program, Department of Chemistry, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Physical Chemistry Chemical Physics : PCCP
|June 15, 2011
PubMed
Summary

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MOS Capacitor01:25

MOS Capacitor

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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Thermal nitridation of reduced graphene oxide creates highly conductive N-doped graphene. These nitrogen-doped graphene sheets enable high-performance supercapacitors, even without carbon additives, operating at higher voltages.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Reduced graphene oxide (rGO) is a promising material for energy storage but often requires additives to enhance conductivity.
  • Achieving high conductivity and performance in graphene-based electrodes is crucial for advanced supercapacitors.

Purpose of the Study:

  • To develop a method for producing highly conductive N-doped graphene sheets from reduced graphene oxide.
  • To investigate the electrochemical performance of these N-doped graphene sheets in supercapacitors, particularly at higher operating voltages.

Main Methods:

  • Reduced graphene oxide sheets were subjected to thermal nitridation.
  • The resulting N-doped graphene sheets were characterized for their conductivity and structural properties.
  • Supercapacitors were fabricated using N-doped graphene electrodes without carbon additives and tested for energy and power delivery.

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Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors
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Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

Published on: November 30, 2021

Related Experiment Videos

Last Updated: Jun 1, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors
10:57

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

Published on: November 30, 2021

Main Results:

  • Thermal nitridation restored the graphene network and introduced N-doping, yielding highly conductive N-doped graphene sheets (∼1000-3000 S m(-1)).
  • Supercapacitors utilizing these N-doped graphene electrodes demonstrated remarkable energy and power densities.
  • High performance was achieved even without carbon additives, particularly when operated at higher voltages (0-4 V).

Conclusions:

  • Thermal nitridation is an effective method to produce highly conductive N-doped graphene from rGO.
  • N-doped graphene electrodes offer superior performance in supercapacitors, eliminating the need for carbon additives.
  • The developed N-doped graphene is a promising material for high-voltage supercapacitor applications.