A Liquid Metal-Enhanced Wearable Thermoelectric Generator

Area of Science:

• Materials Science
• Energy Harvesting
• Biomedical Engineering

Background:

• Continuous power supply is a major challenge for wearable health monitoring systems.
• Existing solutions often rely on batteries or limited energy harvesting methods.
• There is a need for efficient and flexible power sources integrated with wearable devices.

Purpose of the Study:

• To develop a novel liquid metal-enhanced wearable thermoelectric generator (LM-WTEG) for continuous self-powering of wearable health monitoring systems.
• To utilize body heat as a sustainable energy source for personal electronics.
• To design a flexible and efficient energy harvesting device adaptable to the human body.

Main Methods:

• Design and fabrication of a flexible finned heat sink using gallium-based liquid metal alloys.
• Integration of the liquid metal heat sink with a wearable thermoelectric generator (WTEG).
• Characterization of the LM-WTEG's performance under simulated body heat conditions and natural convection.

Main Results:

• The LM-WTEG demonstrated high biaxial flexibility for optimal skin contact.
• Achieved a high output power density of 275 μW/cm² from a simulated 37°C heat source.
• Successfully powered an energy management unit, multi-parameter sensors, and a Bluetooth module (total consumption ~65 μW).

Conclusions:

• The developed LM-WTEG offers a promising solution for self-powered wearable health monitoring.
• The device effectively converts body heat into electricity, meeting the power demands of sensor systems.
• This technology enables continuous, untethered operation of personal health monitoring devices.