Wedemonstrateacylindrical rotatingtriboelectricnanogenerator(TENG)basedonsliding electrification for harvesting mechanical energy from rotational motion. The rotating TENG is based on a coreshell structure that is made of distinctly different triboelectric materials with alternative strip structuresonthesurface.Thechargetransferisstrengthenedwiththeformationofpolymernanoparticles onsurfaces. During coaxial rotation,a contact-induced electrification andthe relative slidingbetween the contactsurfacesofthe coreand theshellresultinanin-planelateral polarization, whichdrivesthe flow of electrons in the external load. A power density of 36.9 W/m 2 (short-circuit current of 90 μA and open- circuit voltage of 410 V) has been achieved by a rotating TENG with 8 strip units at a linear rotational velocity of 1.33 m/s (a rotation rate of 1000 r/min). The output can be further enhanced by integrating morestripunitsand/orapplyinglargerlinearrotationalvelocity.Thisrotating TENGcanbeusedasadirectpowersourcetodrivesmallelectronics,suchas LED bulbs. This study proves the possibility to harvest mechanical energy by TENGs from rotational motion, demonstrating its potential for harvesting the flow energy of air or water for applications such as self-powered environmental sensors and wildlife tracking devices.
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