A new flexible supercapacitor developed by engineers at the University of Glasgow uses human sweat to safely store energy for smart wearable devices, replacing the need for conventional batteries. The technology uses a thin, polyester cellulose-coated cloth that interacts with sweat to create an electrochemical reaction with a charging capacity.

Unlike conventional batteries, these energy storage devices aren’t produced using materials harmful to the environment and won’t risk the health of the wearer if a leak occurs.

Schematic of self‐powered power pack and image. Source: University of Glasgow