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Recyclable Conjugated Polyelectrolyte Hydrogels for Pseudocapacitor Fabrication.

Yan Jiang1,2, Ricardo Javier Vázquez1,2,3,4, Samantha R McCuskey1,2,3

  • 1Departments of Chemistry and Chemical & Biomolecular Engineering, National University of Singapore, 119077, Singapore.

ACS Applied Materials & Interfaces
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Summary

Conjugated polyelectrolyte (CPE) hydrogels offer a sustainable solution for energy storage. These recyclable materials demonstrate excellent electrochemical stability and performance, supporting circular economy principles.

Keywords:
conjugated polyelectrolytescycling stabilityenergy storageorganic mixed ionic-electronic conductorsrecyclable pseudocapacitive material

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Growing demand for sustainable energy storage solutions.
  • Need for environmentally friendly and recyclable materials in pseudocapacitors.
  • Conjugated polyelectrolyte (CPE) hydrogels as promising candidates.

Purpose of the Study:

  • To investigate the electrochemical performance and recyclability of CPE hydrogels for energy storage.
  • To evaluate the stability and capacitance retention of these materials over extended cycling.
  • To explore the potential of CPE hydrogels in a circular recycling strategy.

Main Methods:

  • Preparation of anionic CPE hydrogels (Pris-CPE-K).
  • Electrochemical characterization using galvanostatic charge-discharge (GCD) cycles in 2 M NaCl.
  • Recycling process involving water extraction and dialysis.
  • Structural and rheological characterization using NMR, FTIR, Raman, XPS, GPC, and rheometry.

Main Results:

  • Pris-CPE-K hydrogels showed a specific capacitance of 32.6 ± 6.6 F g⁻¹ with 80% retention after 100,000 GCD cycles.
  • Recycled CPE hydrogels (Re-CPE-Na) maintained initial capacitance of 26.3 ± 1.2 F g⁻¹ and 77% retention after 100,000 cycles.
  • Structural integrity was preserved, with minor changes in rheological properties.

Conclusions:

  • CPE hydrogels are recyclable, electrochemically stable, and environmentally friendly pseudocapacitive materials.
  • These hydrogels are suitable for energy storage applications, demonstrating long-term stability.
  • CPE hydrogels present a viable materials platform for economically viable circular recycling strategies.