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Interfacial Engineering for High-Output, Mechanically Robust Fully Stretchable Moisture-Electric Generators.

Qi Meng1,2, He Zhang3,4, Jiayun Feng1

  • 1State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.

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This summary is machine-generated.

Researchers developed highly adhesive hydrogels for durable moisture-electric generators. These devices offer stable power for wearable electronics and respiration monitoring, overcoming previous limitations in output and fragility.

Keywords:
Full stretchabilityHydrogelInterfacial engineeringMoisture-electric generators

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Wearable Electronics

Background:

  • Fully stretchable hydrogel-based moisture-electric generators (FSHMEGs) show potential for powering electronics but suffer from low output and mechanical fragility.
  • Weak interfacial adhesion in multilayered architectures limits charge and load transfer during device operation.

Purpose of the Study:

  • To engineer an intrinsically adhesive hydrogel for robust hydrogel-electrode interfaces in FSHMEGs.
  • To enhance electrical output, mechanical durability, and long-term stability of FSHMEGs.

Main Methods:

  • Development of an intrinsically adhesive hydrogel material.
  • Fabrication of multilayered FSHMEGs utilizing the novel hydrogel.
  • Characterization of electrical performance under varying humidity and mechanical stress.
  • Assessment of device durability through folding and stretching tests.

Main Results:

  • The novel hydrogel forms robust interfaces, enabling efficient charge and load transfer.
  • The FSHMEG achieved an open-circuit voltage of 0.94 V and current density of 141 µA cm⁻² at 85% relative humidity.
  • The device demonstrated exceptional durability, maintaining stable output after 8000 folding and 1000 stretching cycles (80% strain).
  • Stable power output was sustained for over 220 hours.

Conclusions:

  • The interfacial engineering strategy significantly improves FSHMEG performance and durability.
  • The developed FSHMEGs are suitable for non-invasive respiration monitoring and powering wearable electronics like ECG sensors.
  • This approach provides a practical route for high-performance moisture-electric generators for energy harvesting and bioelectronics.