期刊
ACS NANO
卷 9, 期 7, 页码 7479-7487出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02575
关键词
mechanical energy harvesting; triboelectric nanogenerators; automatic transition; contact and noncontact states; robustness improvement
类别
资金
- Hightower Chair Foundation
- Thousands Talent program for pioneer researchers and their innovation team
Although a triboelectric nanogenerator (TENG) has been developed to be an efficient approach to harvest mechanical energy, its robustness and lifetime are still to be improved through an effective and widely applicable way. Here, we show a rational designing methodology for achieving a significant improvement of the long-term stability of TENGs through automatic transition between contact and noncontact working states. This is realized by structurally creating two opposite forces in the moving part of the TENG, in which the pulling-away force is controlled by external mechanical motions. In this way, TENGs can work in the noncontact state with minimum surface wear and also transit into contact state intermittently to maintain high triboelectric charge density. A wind-driven disk-based TENG and a rotary barrel-based TENG that can realize automatic state transition under different wind speeds and rotation speeds, respectively, have been demonstrated as two examples, in which their robustness has been largely improved through this automatic transition. This methodology will further expand the practical application of TENGs for long-time usage and for harvesting mechanical energies with fluctuating intensities.
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