Compressible supercapacitors were fabricated, with the aid of green tea extract, to power soft wearable electronic devices.

The power may be sufficient to power a heart rate monitor.Researchers from the Council of Scientific and Industrial Research and the Academy of Scientific and Innovative Research, both in India, used the extract to infuse polymer gels with polyphenols, which converted a silver nitrate solution into a uniform coating of silver nanoparticles.

Thin layers of conducting gold and poly(3,4-ethylenedioxythiophene) were then applied. The resulting supercapacitor demonstrated power and energy densities of 2,715 W/kg and 22 Wh/kg, respectively, in the uncompressed state. This is sufficient to operate a heart rate monitor, LEDs, or a Bluetooth module.

The researchers tested the device's durability and found that it performed well even after being compressed more than 100 times.