An Ultra-Low-Friction Triboelectric–Electromagnetic Hybrid Nanogenerator for Rotation Energy Harvesting and Self-Powered Wind Speed Sensor

Wang, Peihong; Pan, Lun; Wang, Jiyu; Xu, Minyi; Dai, Guozhang; Zou, Haiyang; Dong, Kai; Wang, Zhong Lin

doi:10.1021/acsnano.8b04654

Cited by 310 publications

(173 citation statements)

References 41 publications

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“…Furthermore, the output performance of DC‐TENGs is influenced by the length of blade and triboelectric materials. Compared with the polytetrafluoroethylene (PTFE) film and the Kapton film, the output performance generating by the mutual sliding friction between the FEP film and triboelectric power‐generating units has a higher output 12. For the length of blade, there exists the maximum output performance when the length of blades is equal to that of a piece of electrode.…”

Section: Resultsmentioning

confidence: 99%

Cylindrical Direct‐Current Triboelectric Nanogenerator with Constant Output Current

Wang

Xie

et al. 2020

Advanced Energy Materials

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In this article, a cylindrical direct‐current triboelectric nanogenerator (DC‐TENG) that can generate an almost constant current output with a low crest factor by phase coupling is reported for the first time. Here, the influence of phases (P) and groups (G) on the DC‐TENG is investigated. Experiments show that the crest factor of current, significantly decreases as the phases increase, and the output performance significantly increases as the groups increase. One phase triboelectric power‐generating unit of the DC‐TENG with three‐phase and five‐group (3P5G) produces an open‐circuit voltage of 149.5 V, short‐circuit current 7.3 μA, and transferred charge of 56.7 nC at 600 rpm. The DC‐TENG can produce a coupling current of 21.6 μA and the average output power of 2.04 mW after each phase output is rectified and superimposed. Additionally, the crest factor of output current is reduced to 1.08, and the high‐performance characteristics of an almost constant direct‐current is achieved. The research is of considerable significance to the practical applications of TENGs in powering sensors of low consumption.

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Section: Resultsmentioning

confidence: 99%

Cylindrical Direct‐Current Triboelectric Nanogenerator with Constant Output Current

Wang

Xie

et al. 2020

Advanced Energy Materials

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“…In the aforementioned process, the VTENG works at a vertical contact-separation mode and the potential difference between the aluminum electrodes for the main TENG or secondary TENG can be calculated as [36]: (1) where Q is the charge transferred through the external circuit, S is the contact area of the triboelectric layers, ε0 is the dielectric constant of air, εP is the relative dielectric constant of PDMS, δ is the thickness of the patterned PDMS thin film, d is the initial distance between top electrode and top surface of the PDMS film, zi(t) is the relative displacement of the top electrode with respect to PDMS layer, and σ is the surface charge density of the patterned PDMS film.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…As a result of the rapid development of information technology and the electronics industry, many small-scale electronic devices with low power consumption have emerged. Energy harvesting technology that converts the ambient available energy into electrical energy to power these devices is the best way to overcome the limitation of traditional battery power supply [1][2][3][4]. Mechanical vibration energy, as compared with other kinds of existing energy sources, is the most ubiquitous and popular in our daily life [5].…”

Section: Introductionmentioning

confidence: 99%

A Two-Degree-of-Freedom Cantilever-Based Vibration Triboelectric Nanogenerator for Low-Frequency and Broadband Operation

Tang

Cheng

et al. 2019

Electronics

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With the continual increasing application requirements of broadband vibration energy harvesters (VEHs), many attempts have been made to broaden the bandwidth. As compared to adopted only a single approach, integration of multi-approaches can further widen the operating bandwidth. Here, a novel two-degree-of-freedom cantilever-based vibration triboelectric nanogenerator is proposed to obtain high operating bandwidth by integrating multimodal harvesting technique and inherent nonlinearity broadening behavior due to vibration contact between triboelectric surfaces. A wide operating bandwidth of 32.9 Hz is observed even at a low acceleration of 0.6 g. Meanwhile, the peak output voltage is 18.8 V at the primary resonant frequency of 23 Hz and 1 g, while the output voltage is 14.9 V at the secondary frequency of 75 Hz and 2.5 g. Under the frequencies of these two modes at 1 g, maximum peak power of 43.08 µW and 12.5 µW are achieved, respectively. Additionally, the fabricated device shows good stability, reaching and maintaining its voltage at 8 V when tested on a vacuum compression pump. The experimental results demonstrate the device has the ability to harvest energy from a wide range of low-frequency (<100 Hz) vibrations and has broad application prospects in self-powered electronic devices and systems.Currently, most vibrational energy harvesters (VEHs) are usually designed as resonance systems for higher power output. However, one of the main problems for VEHs with the resonant behavior is the narrow operating bandwidth. Thus, when operated under irregular mechanical vibration sources with low and variable frequencies, most VEHs yield very low and irregular output power, which lowers their practical application possibilities.To solve the problem of narrow bandwidth, many researchers have demonstrated some broadband harvesters by applying multimodal harvesting technique [17][18][19][20][21][22][23]. Multimodal energy harvesters are considered more efficient in matching multiple frequencies to better utilize kinetic energy. Sari et al. [17], Liu et al. [18], and Qi et al. [19] reported the use of multiple cantilevers or a cantilever array as one solution to increase the bandwidth. However, this type of energy harvester has the disadvantage of being bulky and complex in structure, thus overshadowing its advantages in broadband behavior. Another multimodal system was developed with multiple bending modes in a continuous beam, rather than using arrays of cantilevers configuration [20][21][22][23]. Ou et al. presented a broadband energy harvester with a two-mass cantilever beam structure [20]. Due to the addition of an extra mass, two useful working modes can be obtained. Arafa et al. developed a two-degree-of-freedom (2DOF) cantilever-based piezoelectric generator which used the proof mass as a dynamic amplifier [21]. However, the multimodal harvester only increases the number of peak amplitudes, and the bandwidth of each peak is relatively narrow, which still causes a sharp drop in power generation when the excitation...

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“…So, a new type of energy harvester based on vibration energy collection has been widely studied. Vibration energy harvesting is mainly based on electromagnetic [2][3][4][5][6], electrostatic [7,8], triboelectric [9,10], and piezoelectric [11][12][13] conversion mechanisms. Among them, the piezoelectric vibration energy harvester (PVEH) has been widely studied due to its simple structure, high energy density, excellent voltage output, and easy integration with other devices.…”

Section: Introductionmentioning

confidence: 99%

A Direction Self-Tuning Two-Dimensional Piezoelectric Vibration Energy Harvester

Zhao

Wei

Zhong

et al. 2019

Sensors

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Most work from the last decade on the piezoelectric vibration energy harvester (PVEHs) focuses on how to increase its frequency bandwidth but ignores the effect of vibration direction on the output performance of the harvester. However, both the frequency and the direction of the vibration in a real environment are time-variant. Therefore, improving the capability of PVEH to harvest multi-directional vibration energy is also important. This work presents a direction self-tuning two-dimensional (2D) PVEH, which consists of a spring-mass system and a direction self-tuning structure. The spring-mass system is sensitive to external vibration, and the direction self-tuning structure can automatically adjust its plane perpendicular to the direction of the external excitation driven by an external torque. The direction self-tuning mechanism is first theoretically analyzed. The experimental results show that this direction self-tuning PVEH can efficiently scavenge vibration energy in the 2D plane, and its output performance is unaffected by vibration direction and is very stable. Meanwhile, the effect of the initial deflection angle and the vibration acceleration on the direction self-tuning time of the PVEH is investigated. The direction self-tuning mechanism can also be used in other PVEHs with different energy conversion methods for harvesting multi-direction vibration energy.

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An Ultra-Low-Friction Triboelectric–Electromagnetic Hybrid Nanogenerator for Rotation Energy Harvesting and Self-Powered Wind Speed Sensor

Cited by 310 publications

References 41 publications

Cylindrical Direct‐Current Triboelectric Nanogenerator with Constant Output Current

Cylindrical Direct‐Current Triboelectric Nanogenerator with Constant Output Current

A Two-Degree-of-Freedom Cantilever-Based Vibration Triboelectric Nanogenerator for Low-Frequency and Broadband Operation

A Direction Self-Tuning Two-Dimensional Piezoelectric Vibration Energy Harvester

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