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Doped photo-crosslinked polyesteramide hydrogels as solid electrolytes for supercapacitors.

Guillem Ruano1, Jordi Tononi, David Curcó

  • 1Departament d'Enginyeria Química and Barcelona Research Center for Multiscale Science and Engineering, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, 08019, Barcelona, Spain. joan.torras@upc.edu carlos.aleman@upc.edu.

Soft Matter
|August 14, 2020
PubMed
Summary

Researchers developed advanced hydrogels for flexible supercapacitors. Incompletely crosslinked unsaturated polyesteramide hydrogels (UPEA-Phe/NaCl) show superior performance as solid electrolytes, outperforming other hydrogel types.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • High-performance hydrogels are essential solid electrolytes for flexible electrochemical supercapacitors (ESCs).
  • Renewable, biodegradable, and biocompatible hydrogels offer sustainable and biomedical advantages for solid-state ESCs.
  • Unsaturated polyesteramide hydrogels doped with NaCl (UPEA-Phe/NaCl) are investigated for their potential as advanced solid electrolytes.

Purpose of the Study:

  • To investigate the efficacy of photo-crosslinked unsaturated polyesteramide hydrogels as solid electrolytes for flexible electrochemical supercapacitors.
  • To explore the relationship between hydrogel structure, ion migration, and electrochemical performance.
  • To compare the performance of UPEA-Phe/NaCl hydrogels with other hydrogel types in ESC devices.

Main Methods:

  • Atomistic molecular dynamics simulations to analyze hydrogel pore structure and ion (Na+, Cl-) migration.
  • Experimental synthesis of UPEA-Phe/NaCl hydrogels with varying photo-crosslinking times (4h and 8h).
  • Fabrication and electrochemical testing (potentiodynamic and galvanostatic studies) of ESCs using UPEA-Phe/NaCl hydrogels and poly(3,4-ethylenedioxythiophene) electrodes.

Main Results:

  • Molecular dynamics simulations indicated that incomplete photo-crosslinking enhances ion migration in UPEA-Phe/NaCl hydrogels.
  • Experimental results confirmed that UPEA-Phe/NaCl hydrogels prepared with a 4h UV exposure (incomplete crosslinking) exhibited superior solid electrolyte behavior.
  • The 4h UPEA-Phe/NaCl hydrogel demonstrated significantly better performance compared to polypeptide and polysaccharide hydrogels in identical ESC configurations.

Conclusions:

  • Optimizing the photo-crosslinking process is critical for maximizing the performance of unsaturated polyesteramide hydrogels as solid electrolytes.
  • UPEA-Phe/NaCl hydrogels, particularly those with incomplete crosslinking, represent a promising class of materials for advanced flexible electrochemical supercapacitors.
  • These findings pave the way for developing sustainable and high-performance energy storage devices with potential biomedical applications.