Radial-arrayed rotary electrification for high performance triboelectric generator

Zhu, Guang; Chen, Jun; Tie-jun, Zhang; Jing, Qingshen; Wang, Zhong Lin

doi:10.1038/ncomms4426

Cited by 770 publications

(503 citation statements)

References 38 publications

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“…Although schemes in high-frequency or ultrahigh-frequency wireless power transfer satisfy requirements in many important contexts (14,15), opportunities remain for approaches in local generation and/or storage of power in ways that retain overall stretchable characteristics at the system level. Reported approaches to the former involve harvesting based on piezoelectric (16,17), triboelectric (18), and thermoelectric (19) effects; the latter includes batteries (20)(21)(22) and supercapacitors (23,24) enabled by various unusual materials. Complete power management systems that offer both types of functionality, in an actively coordinated fashion and with robust, high-performance operation, represent an important goal.…”

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confidence: 99%

Soft, thin skin-mounted power management systems and their use in wireless thermography

Lee

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

141

133

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Power supply represents a critical challenge in the development of body-integrated electronic technologies. Although recent research establishes an impressive variety of options in energy storage (batteries and supercapacitors) and generation (triboelectric, piezoelectric, thermoelectric, and photovoltaic devices), the modest electrical performance and/or the absence of soft, biocompatible mechanical properties limit their practical use. The results presented here form the basis of soft, skin-compatible means for efficient photovoltaic generation and high-capacity storage of electrical power using dual-junction, compound semiconductor solar cells and chip-scale, rechargeable lithium-ion batteries, respectively. Miniaturized components, deformable interconnects, optimized array layouts, and dual-composition elastomer substrates, superstrates, and encapsulation layers represent key features. Systematic studies of the materials and mechanics identify optimized designs, including unusual configurations that exploit a folded, multilayer construct to improve the functional density without adversely affecting the soft, stretchable characteristics. System-level examples exploit such technologies in fully wireless sensors for precision skin thermography, with capabilities in continuous data logging and local processing, validated through demonstrations on volunteer subjects in various realistic scenarios.solid-state lithium-ion battery | multijunction solar cell | stretchable electronics | energy management | wearable technology R ecent ideas in materials science and mechanical engineering establish strategies for integrating functionality enabled by hard forms of electronics with compliant interconnects and soft packages to yield hybrid systems that offer low-modulus, elastic responses to large strain deformations (1-4). Such stretchable characteristics are qualitatively different from those afforded by simple mechanical bendability; the consequences are important because such properties allow for intimate, long-lived interfaces with the human body, such as the skin (5, 6), heart (7), and the brain (8), and for development of unusual device designs that derive inspiration from biology (9, 10). Many impressive examples of the utility of these concepts have emerged over the last several years, particularly in the area of biomedical devices, where work in skin-mounted technologies is now moving from laboratory demonstrations to devices with proven utility in human clinical studies (11, 12) and even to recently launched commercial products (13). Although schemes in high-frequency or ultrahigh-frequency wireless power transfer satisfy requirements in many important contexts (14, 15), opportunities remain for approaches in local generation and/or storage of power in ways that retain overall stretchable characteristics at the system level. Reported approaches to the former involve harvesting based on piezoelectric (16, 17), triboelectric (18), and thermoelectric (19) effects; the latter includes batteries (20-22) and supercapa...

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mentioning

confidence: 99%

Soft, thin skin-mounted power management systems and their use in wireless thermography

Lee

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

141

133

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“…[ 2,4,7,9,13,[19][20][21][22][23][24][25] So far, the electric power output of TENGs has been improved up to ≈500 W m −2 by sophisticated design of device structure. [ 18,[26][27][28] Demonstrated TENGs have been working in four modes, that is, the contact-separation or contact mode in short, sliding mode, single-electrode mode, and free-standing triboelectric-layer mode. The performance of the TENGs in contact-mode is better than that of TENGs in the sliding mode, because a much higher maximum displacement of TENGs in the sliding mode is required than that of TENGs working in the contact-mode, in order to achieve the same level of open circuit voltage.…”

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confidence: 99%

A Fully Verified Theoretical Analysis of Contact‐Mode Triboelectric Nanogenerators as a Wearable Power Source

Bao

Zeng

Peng

et al. 2016

Advanced Energy Materials

159

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cost, environmental friendliness, and universal availability. [6][7][8][9][10][11][12][13][14][15][16][17][18] To improve the performance and broaden the applications of TENGs, numerous efforts have been made with focus on both enhancement of the surface charge density and development of new structures/modes. [ 2,4,7,9,13,[19][20][21][22][23][24][25] So far, the electric power output of TENGs has been improved up to ≈500 W m −2 by sophisticated design of device structure. [ 18,[26][27][28] Demonstrated TENGs have been working in four modes, that is, the contact-separation or contact mode in short, sliding mode, single-electrode mode, and free-standing triboelectric-layer mode. The performance of the TENGs in contact-mode is better than that of TENGs in the sliding mode, because a much higher maximum displacement of TENGs in the sliding mode is required than that of TENGs working in the contact-mode, in order to achieve the same level of open circuit voltage. [ 29 ] The TENGs working in the contact-mode are particularly interesting for applications like foot-mounted wearable electronic systems because of the short vertical displacement involved and ease of integration.The fundamental principle of TENGs is based on the coupled effects of triboelectrifi cation and electrostatic induction. A theoretical model has been proposed for the TENGs working in the contact mode by Wang and co-workers. By utilizing the derived governing equation, the real-time output characteristics and the relationship between the optimum external resistance and TENG para meters were numerically simulated. [ 30 ] However, the model was not validated by corresponding experiments with measured real-time output characteristics. Furthermore, it is known that the real-time output characteristics would be affected by the materials, device structural parameters, operation conditions, and equivalent resistance. Assumptions made on simple profi les of working velocity may infl uence the model's validity in real situations. For instance, during real human walking, the previous wearing trials of an intelligent footwear system illustrated that the velocity profi le was complex and varied signifi cantly with time for a foot-mounted device. [ 31,32 ] Therefore, it is highly desirable to develop a theoretical model that is fully verifi ed by corresponding experiments. Such an experimentally verifi ed model is essential for designing and optimizing TENGs for intended applications.In this paper, based on conservation of charges and zerovoltage for close-loop circuits, a theoretical model is presented Harvesting mechanical energy from human activities by triboelectric nanogenerators (TENGs) is an effective approach for sustainable, maintenance-free, and green power source for wireless, portable, and wearable electronics. A theoretical model for contact-mode triboelectric nanogenerators based on the principles of charge conservation and zero loop-voltage is illustrated. Explicit expressions for the output current, voltage, and power are presented for the TENGs ...

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“…The recently invented triboelectric generator harvests mechanical energy through a periodic contact motion based on the coupling of the triboelectric and electrostatic effects, and many approaches have been carried out to improve the electrical output performance of the triboelectric generator [8][9][10][11][12][13][14][15][16] . A triboelectric generator is one of the most promising energy conversion systems due to its low cost, simple fabrication routes and the possibility of high-power density 17,18 .…”

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confidence: 99%

Flutter-driven triboelectrification for harvesting wind energy

et al. 2014

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Technologies to harvest electrical energy from wind have vast potentials because wind is one of the cleanest and most sustainable energy sources that nature provides. Here we propose a flutter-driven triboelectric generator that uses contact electrification caused by the selfsustained oscillation of flags. We study the coupled interaction between a fluttering flexible flag and a rigid plate. In doing so, we find three distinct contact modes: single, double and chaotic. The flutter-driven triboelectric generator having small dimensions of 7.5 Â 5 cm at wind speed of 15 ms À 1 exhibits high-electrical performances: an instantaneous output voltage of 200 V and a current of 60 mA with a high frequency of 158 Hz, giving an average power density of approximately 0.86 mW. The flutter-driven triboelectric generation is a promising technology to drive electric devices in the outdoor environments in a sustainable manner.

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Radial-arrayed rotary electrification for high performance triboelectric generator

Cited by 770 publications

References 38 publications

Soft, thin skin-mounted power management systems and their use in wireless thermography

Soft, thin skin-mounted power management systems and their use in wireless thermography

A Fully Verified Theoretical Analysis of Contact‐Mode Triboelectric Nanogenerators as a Wearable Power Source

Flutter-driven triboelectrification for harvesting wind energy

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