TENG/ micro supercapacitor self-charging power supply uses cost-effective/ simplified fabrication; pressing for 147 seconds charges watch to 1.6 V

https://www.eurekalert.org/news-releases/1107394

"TENGs excellent at harvesting mechanical energy from human motion, which when integrated with micro supercapacitors have stable output, but complex, expensive, slow fabrication like 3D printing/ laser cutting prevents large-scale production... overcome with: (1) TENG Conductive Layer created via a dip-spin-coating using MXene paste, (2) MSC electrode created via mask-assisted graphene solution vacuum filtration... press TENG with palm... 0.653 V/ minute charging efficiency"

Related: Polymer beads generate electricity for self-charging devices using simple friction
https://phys.org/news/2025-11-polymer-beads-generate-electricity-devices.html