Journal
ADVANCED ENERGY MATERIALS
Volume 5, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201501467
Keywords
mechanical energy harvesting; rolling structure; triboelectric nanogenerators; wave energy
Categories
Funding
- Hightower Chair foundation
- Thousands Talents program for pioneer researcher
- National Natural Science Foundation of China [51432005]
- China and Beijing City Committee of Science and Technology [Z131100006013004, Z131100006013005]
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Water waves are increasingly regarded as a promising source for large-scale energy applications. Triboelectric nanogenerators (TENGs) have been recognized as one of the most promising approaches for harvesting wave energy. This work examines a freestanding, fully enclosed TENG that encloses a rolling ball inside a rocking spherical shell. Through the optimization of materials and structural parameters, a spherical TENG of 6 cm in diameter actuated by water waves can provide a peak current of 1 A over a wide load range from a short-circuit condition to 10 G, with an instantaneous output power of up to 10 mW. A multielectrode arrangement is also studied to improve the output of the TENG under random wave motions from all directions. Moreover, at a frequency of 1.43 Hz, the wave-driven TENG can directly drive tens of LEDs and charge a series of supercapacitors to rated voltage within several hours. The stored energy can power an electronic thermometer for 20 min. This rolling-structured TENG is extremely lightweight, has a simple structure, and is capable of rocking on or in water to harvest wave energy; it provides an innovative and effective approach toward large-scale blue energy harvesting of oceans and lakes.
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