Introduction

Wearable devices like fitness trackers and medical sensors are changing how we interact with technology. A new breakthrough by engineers at Dongguk University introduces gel-based triboelectric nanogenerators (TENGs) that promise to power these devices sustainably, eliminating the need for traditional batteries.

The Innovation: Gel Polymer Electrode-Based TENGs

To address challenges in flexibility and durability, Professor Jung Inn Sohn’s team developed a gel polymer electrode-based triboelectric nanogenerator (GPE-TENG).

The device:

• Flexible and durable: Stretches up to 375% without damage.
• Semi-transparent: Ideal for discreet wearable applications.
• Long-lasting performance: Withstands two months of continuous use without degradation.

How It Works

The team utilized an innovative in-situ curing process to create the GPE-TENG:

1. Materials Used: A gel mix of polyethylene oxide (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).
2. Fabrication Process:
   • Gel poured into an ecoflex mold.
   • Covered with another ecoflex layer.
   • Cured at 70°C for 12 hours to ensure strong bonding.
3. Output: Generates 0.36 W/m² peak power under a 15 MΩ load.

Applications in Wearable Technology

The GPE-TENG has diverse potential uses, including:

• Health Monitoring: Tracking joint activity for rehabilitation.
• Biometric Systems: Enabling smart door or locker access.
• Sustainable Power: Powering wearable sensors without batteries.

“This technology paves the way for flexible and sustainable electronics, with applications in health care, security, and biometrics,” says Prof. Sohn.

Conclusion

The gel-based TENG developed by Dongguk University marks a significant step forward in wearable technology. Its flexibility, durability, and sustainable energy output make it a promising solution for next-generation wearables.