Triboelectric nanogenerators (TENGs). which convert mechanical energy into electrical energy. have been applied in the fields of wearable devices. environmental monitoring. https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC530-WUH721414ALE6L1-0F31170-14TB-7-2K-RPM-SATA-6Gb-s-512e-SED-3-5in-Hard-Drive/