4.8 Article

Maximized Effective Energy Output of Contact-SeparationTriggered Triboelectric Nanogenerators as Limited by Air Breakdown

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 24, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201700049

Keywords

electrical breakdown; energy harvesting; nanogenerators; output performance

Funding

  1. National Science Foundation [DMR-1505319]
  2. KAUST
  3. Hightower Chair foundation
  4. Thousands Talents program for pioneer researcher and his innovation team, China

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Recent progress in triboelectric nanogenerators (TENGs) has demonstrated their promising potential as a high-efficiency mechanical energy harvesting technology, and plenty of effort has been devoted to improving the power output by maximizing the triboelectric surface charge density. However, due to high-voltage air breakdown, most of the enhanced surface charge density brought by material/surface optimization or external ion injection is not retainable or usable for electricity generation during the operation of contact-separation-triggered TENGs. Here, the existence of the air breakdown effect in a contact-separation mode TENG with a low threshold surface charge density of approximate to 40-50 mu C m(-2) is first validated under the high impedance external load, and then followed by the theoretical study of the maximized effective energy output as limited by air breakdown for contact-separation-triggered TENGs. The effects of air pressure and gas composition are also studied and propose promising solutions for reducing the air breakdown effect. This research provides a crucial fundamental study for TENG technology and its further development and applications.

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