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

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

Published on: January 7, 2022

PEDOT:Nafion for Highly Efficient Supercapacitors.

Małgorzata Skorupa^1,2, Krzysztof Karoń^1,3, Edoardo Marchini⁴

¹Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, M. Strzody 9, Gliwice 44-100, Poland.

ACS Applied Materials & Interfaces

|April 23, 2024

Summary

This summary is machine-generated.

Researchers developed a new supercapacitor material, PEDOT/Nafion, offering improved energy storage. This PEDOT/Nafion material demonstrates superior performance compared to traditional PEDOT/PSS, enhancing energy density and cycling stability for advanced energy storage applications.

Keywords:

Nafion PEDOT capacitance secondary doping supercapacitor

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Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization

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Published on: July 11, 2012

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Supercapacitors are vital energy storage devices known for high power density and long cycle life.
Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) is a benchmark organic electronic material, but its capacitive performance can be further enhanced.
Improving the capacitive characteristics of conductive polymers is crucial for next-generation energy storage solutions.

Purpose of the Study:

To introduce Nafion as a novel polymeric counterion for poly(3,4-ethylenedioxythiophene) (PEDOT), creating highly capacitive PEDOT/Nafion.
To investigate the enhancement of supercapacitive properties of PEDOT/Nafion through treatment with dimethyl sulfoxide or ethylene glycol.
To evaluate the electrochemical performance and stability of PEDOT/Nafion-based supercapacitors.

Main Methods:

Synthesis of PEDOT/Nafion films.
Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge.
Spectroscopic studies to confirm ion diffusion mechanisms.
Fabrication and testing of a proof-of-concept symmetric supercapacitor device.

Main Results:

PEDOT/Nafion films exhibited high areal capacitance (22 mF cm^-2) and volumetric capacitance (74 F cm^-3).
The material showed low charge transfer resistance (∼380 Ω), high Coulombic efficiency (99%), and an energy density of 23.1 ± 1.5 mWh cm^-3.
A symmetric supercapacitor based on PEDOT/Nafion demonstrated a specific capacitance of 15.7 F g^-1 and excellent long-term stability (98.7% capacitance retention after 1000 cycles).

Conclusions:

PEDOT/Nafion offers superior supercapacitive properties compared to PEDOT/PSS due to enhanced ion diffusion.
The PEDOT/Nafion material, particularly after solvent treatment, presents a promising alternative for high-performance energy storage devices.
This study highlights the potential of Nafion as a counterion for developing advanced conductive polymer-based supercapacitors.