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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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Flexible Conductive Cellulose Network-Based Composite Hydrogel for Multifunctional Supercapacitors.

Shaoqiu Ke1, Zhiqi Wang1, Kai Zhang1

  • 1Guangxi Key Laboratory of Processing for Nonferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.

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|June 24, 2020
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Summary

Researchers developed a sustainable cellulose-based composite hydrogel supercapacitor. This dual-function device offers excellent energy storage and tunable transparency, paving the way for advanced multifunctional energy devices.

Keywords:
cellulose networkelectrochromic supercapacitorintegrated structurepolyaniline

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • The demand for sustainable and versatile energy storage devices is increasing.
  • Biomass-based materials offer a renewable alternative for energy applications.
  • Developing multi-functional energy storage devices is a key research direction.

Purpose of the Study:

  • To construct a symmetric dual-function supercapacitor using a cellulose network/polyacrylamide/polyaniline (CPP) composite hydrogel.
  • To evaluate the electrochemical performance and optical properties of the developed supercapacitor.
  • To demonstrate the potential for multifunctional devices based on natural renewable materials.

Main Methods:

  • Fabrication of a CPP composite hydrogel.
  • Assembly of a symmetric supercapacitor device using the CPP hydrogel.
  • Electrochemical characterization including capacitance, energy density, power density, and cycling stability.
  • Optical transmittance measurements before and after electrification, and under applied potential.

Main Results:

  • The CPP composite hydrogel supercapacitor exhibited excellent electrochemical performance.
  • Achieved areal capacitance of 1.73 mF/cm2 at 5 mV/s and energy density of 0.62 µW h/cm2 at a power density of 7.03 µW/cm2.
  • Demonstrated a wide electrochemical window of 1.6 V, good cycling stability, and tunable transmittance with a 9.6% decrease after electrification at 3 V.
  • Showcased periodic transmittance changes under square potential input, indicating dual functionality.

Conclusions:

  • The developed cellulose-based composite hydrogel supercapacitor exhibits promising electrochemical and optical properties.
  • The dual-functionality of energy storage and tunable transmittance is achieved.
  • This construction strategy provides a foundation for creating multifunctional devices from renewable materials.