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Stable Flexible Electronic Devices under Harsh Conditions Enabled by Double-Network Hydrogels Containing Binary

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Chemically/physically cross-linked double-network (DN) hydrogels with binary cations offer enhanced stability for flexible electronics. These advanced hydrogels enable high-performance mechanosensors and supercapacitors under harsh conditions.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Hydrogels are crucial for flexible electronics but often lack mechanical and electrochemical stability in harsh environments.
  • Existing hydrogel-based devices face limitations in durability and performance under extreme conditions.

Purpose of the Study:

  • To develop robust double-network (DN) hydrogels with binary cations (Zn2+ and Li+) for improved flexible electronic applications.
  • To enhance the mechanical robustness, ionic conductivity, and environmental adaptability of hydrogel materials.

Main Methods:

  • Constructed chemically/physically cross-linked DN hydrogels using polyacrylamide (PAM) and κ-Carrageenan (κ-CG).
  • Incorporated binary cations (Zn2+ and Li+) to improve ionic conductivity and environmental adaptability.
  • Fabricated flexible mechanosensors and zinc-ion hybrid supercapacitors using the developed DN hydrogels.

Main Results:

  • Achieved excellent mechanical robustness and high ionic conductivity (2.26 S·m-1 at 25 °C, 1.54 S·m-1 at -25 °C).
  • Developed flexible mechanosensors with high gauge factors (resistive: 2.4; capacitive: 0.82 kPa-1) and stable sensing capabilities.
  • Demonstrated zinc-ion hybrid supercapacitors with high initial capacity (52.5 mAh·g-1) and excellent cycle stability (82.9% retention after 19,000 cycles) even at -25 °C.

Conclusions:

  • The developed DN hydrogels containing binary cations exhibit superior mechanical and electrochemical properties for flexible electronics.
  • These hydrogels are promising for high-performance flexible electronic devices, including sensors and energy storage, operating under harsh conditions.
  • The study highlights the potential of binary cation-doped DN hydrogels for advanced material applications in extreme environments.