A new discovery from the National University of Singapore has yielded a material that could be used to create battery-free, wearable sensors to power your electronics from the energy generated via muscle movement.
The sensor, which is the size of a postage stamp, uses human skin as one of its charge-collectors. The device takes advantage of static electricity to convert mechanical energy into electricity. It is powered by the wear’s daily activities such as walking, talking, or simply holding an object.
This from IEEE Spectrum:
They tested the device by attaching it to a subject’s forearm or throat, nanopillar side down. Fist-clenching and speaking produced 7.3V and 7.5V respectively. The researchers tested the device as a human motion/activity sensor by attaching it on the forearm and measuring the pulse generated due to holding and releasing of an object.