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Self-Healable and Stretchable Ionic-Liquid-Based Thermoelectric Composites with High Ionic Seebeck Coefficient.

Zico Alaia Akbar1, Yoga Trianzar Malik2, Dong-Hu Kim1

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Summary

This study introduces self-healable, flexible ionic thermoelectric composites for wearable electronics. These materials efficiently harvest low-grade heat, offering superior performance under demanding conditions.

Keywords:
ionic liquid-based compositesionic thermoelectricsself-healing materialsstretchable composites

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Wearable Electronics

Background:

  • Wearable electronics require efficient, flexible energy conversion technologies.
  • Ionic thermoelectric (TE) materials offer high thermopower for harvesting low-grade heat.
  • Existing materials often lack self-healing and stretchability.

Purpose of the Study:

  • To develop self-healable, stretchable, and flexible ionic TE composites.
  • To investigate the ionic TE properties and self-healing mechanism.
  • To assess performance under harsh conditions for practical applications.

Main Methods:

  • Composites synthesized using an ionic liquid (EMIM:OTf), PVDF-HFP polymer matrix, and fluoro-surfactant.
  • Self-healability attributed to dynamic ion-dipole interactions.
  • Ionic TE properties measured, including ionic Seebeck coefficient (Si) and figure of merit (ZTi).

Main Results:

  • Achieved high ionic Seebeck coefficient (Si ≈38.3 mV K-1) and ionic figure of merit (ZTi = 2.34 at 90% RH).
  • Demonstrated excellent self-healability due to dynamic ion-dipole interactions.
  • Maintained superior ionic TE properties under 75% strain and after multiple cutting-healing cycles.

Conclusions:

  • The developed IL-based ionic TE composites exhibit promising self-healing and mechanical properties.
  • These materials offer efficient low-grade heat harvesting for self-powered wearable devices.
  • The composites show potential for robust energy solutions in demanding environments.