University of Wollongong researchers develop wave-powered SOS life jacket

Researchers from the University of Wollongong and international collaborators have developed a life jacket prototype capable of generating electricity from wave motion to power an SOS LED display. The technology, detailed in the journal Science Advances, utilizes soft energy harvesters containing two droplets of gallium-based liquid metal submerged in an electrically conducting electrolyte.

As the device moves due to waves or physical motion, the liquid metal droplets shift, altering the surface area in contact with the electrolyte and air. This movement triggers electrochemical reactions that produce a small electrical current, a process known as mechano-electrochemical energy harvesting. While a single unit produces minimal power, connecting 40 devices generated approximately two volts, sufficient to periodically power an LED SOS signal.

The prototype has been tested in both laboratory settings and seawater. Although the technology shows promise for emergency signaling and wearable electronics without the need for traditional batteries, researchers noted that further improvements in power output, durability, and reliability are required before it can be used in real-world rescue operations.