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High-performance supercapacitors based on coarse nanofiber bundle and ordered network hydrogels.

Xin-Xin Chen1, Yu-Xiong Ju1, Bei Zhang1

  • 1Jiangsu Key Laboratory of Sericultural and Animal Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Sericultural Scientific Research Center, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China.

International Journal of Biological Macromolecules
|December 28, 2024
PubMed
Summary
This summary is machine-generated.

This study developed a flexible hydrogel supercapacitor with enhanced mechanical strength and stable electrochemical performance. The novel design maintains over 91% capacitance after 3000 stretches, addressing key challenges in wearable electronics.

Keywords:
Cartilage structureCoarse nanofiber bundle and ordered networkHydrogel supercapacitorsSilk nanofiber

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Flexible hydrogel supercapacitors often fail under strain due to poor mechanical stability and electrochemical performance.
  • Developing robust supercapacitors for wearable applications requires materials that withstand deformation.

Purpose of the Study:

  • To design and fabricate a flexible hydrogel supercapacitor electrode with superior mechanical properties and stable electrochemical performance under tensile strain.
  • To investigate the structure-property relationships of a novel hydrogel electrode for energy storage applications.

Main Methods:

  • Constructed a coarse nanofiber bundle and ordered network skeleton using directional freezing.
  • Prepared a polyvinyl alcohol (PVA)-based hydrogel electrode incorporating carbon nanotubes (CNTs) and polypyrrole (PPy).
  • Evaluated the mechanical properties (tensile strength, fatigue threshold) and electrochemical performance (capacitance retention) under various strain conditions.

Main Results:

  • The PVA-SNF-CNTs-PPy-3 hydrogel electrode exhibited high tensile strength (6.22 MPa) and fatigue threshold (8759.8 J/m²).
  • Achieved a high area-specific capacitance of up to 23.96 F/cm² due to an ordered conductive network.
  • Demonstrated excellent capacitance retention (>98.2% at 150% deformation) and stability (>91.45% after 3000 stretching cycles).

Conclusions:

  • The developed hydrogel electrode offers a promising solution for high-performance flexible supercapacitors.
  • The coarse nanofiber bundle and ordered network structure significantly enhance mechanical reliability and electrochemical stability.
  • This work provides a new strategy for creating mechanically robust and high-capacitance energy storage devices for flexible electronics.