Direct-current, long-lasting and highly efficient electret energy harvesting from ultra-low-frequency motions using toothed clutch mechanism

被引：30

作者：

Tao, Kai ^{[1
,2
]}

Zhao, Zhe ^{[1
,2
]}

Mao, Xinhui ^{[1
,2
]}

Shen, Weihe ^{[3
]}

Qiu, Changquan ^{[3
]}

Qi, Huan ^{[4
]}

Ye, Tao ^{[1
]}

Zhang, Xingxu ^{[1
]}

Wu, Jin ^{[5
]}

Fan, Kangqi ^{[6
]}

Chang, Honglong ^{[1
]}

Yuan, Weizheng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Key Lab Micro & Nano Syst Aerosp, Minist Educ, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Res & Dev Inst Shenzhen, Shenzhen 518057, Peoples R China

[3] China Acad Launch Vehicle Technol, Sci & Technol Space Phys Lab, Beijing 100076, Peoples R China

[4] China Acad Launch Vehicle Technol, Beijing Inst Astronaut Syst Engn, Beijing 100076, Peoples R China

[5] Sun Yat sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Key Lab Display Mat & Technol, Guangzhou 510275, Peoples R China

[6] Xidian Univ, Sch Mechanoelect Engn, Xian 710071, Peoples R China

来源：

NANO ENERGY | 2023年 / 105卷

基金：

中国国家自然科学基金;

关键词：

Triboelectric nanogenerators; Electret power generator; Low -frequency energy harvesting; Direct -current output; Toothed clutch mechanism; Frequency -up mechanism; CURRENT TRIBOELECTRIC NANOGENERATOR; PERFORMANCE; CONTACT; MODE;

D O I：

10.1016/j.nanoen.2022.107998

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Generally, most wearable energy harvesters generate only a small amount of electrical energy from the low -frequency motions of human body and immediately stop working when the activity ends, resulting in low en-ergy extraction efficiency. Here, we propose an electret rotatory energy harvester (e-REH) with a mechanical tooth-clutch transmission system, converting the ultra-low-frequency irregular human motion (< 0.1 Hz) into a high-speed and long-lasting rotation for boosted energy conversion efficiency. The tooth-clutch transmission system is designed with a compact integration of a linear-to-rotation unit, a tooth-clutch transmission unit and an energy storage unit to generate continuous, stable and highly efficient electrical output. Triggered by impulse excitation of gentle hand tapping, the flywheel can continuously rotate for about 45 s inertially, and the maximum speed of the flywheel can reach about 1500 rpm, indicating the frequency is increased up to 4500 times from 0.022 Hz to 100 Hz. In addition, by introducing the multi-layer phase-shift electrode design, a constant direct-current output with a crest factor down to 1.09 is obtained by the phase coupling effect, avoiding the complicated signal processing circuit. Experimental results show the fabricated e-REH can produce an overall coupling current of 22.1 mu A and average output power of 3.95 mW. Thanks to the lightweight, compact and high -efficient transmission design, the e-REH is further integrated into a shoe for wearable energy harvesting and self -powered underground environmental monitoring applications. The research is of considerable significance to the practical applications of e-REH in powering sensors and building self-powered wearable sensor networks.

引用

页数：13