Design and optimization of rotating triboelectric nanogenerator by water electrification and inertia

Kim, Tae-Hun; Chung, Jihoon; Kim, Dae Yun; Moon, Joo Hyun; Lee, Su-Kyung; Cho, Minhaeng; Lee, Seong Hyuk; Lee, Sang‐Min

doi:10.1016/j.nanoen.2016.06.051

Cited by 97 publications

(38 citation statements)

References 33 publications

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“…Triboelectric energy harvesting, which is based on the combination of contact electrification between two different material surfaces and electrical induction, has been spotlighted as a promising technology due to material selection diversity, high efficiency, and shape adaptability. [ 19–34 ] Previous studies of triboelectric energy harvesters, also known as triboelectric nanogenerators (TENGs), have found that the only requirement for generating electricity through a TENG is sequential contact and separation of two different material surfaces, making the TENG a promising portable energy‐harvesting platform. [ 35–46 ] In addition, the advantageous characteristics of the TENG enable it to be used for self‐powered sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Development of a High‐Performance Handheld Triboelectric Nanogenerator with a Lightweight Power Transmission Unit

Choi

Cho

Yun

et al. 2020

Adv Materials Technologies

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To keep pace with the rapid development of portable electronic devices, the demand for stable batteries with enhanced electrical capacities is also growing rapidly, but such demands are not easily met. Thus, energy-harvesting technology is an alternate solution, in which unintentionally abandoned energy is scavenged to supply electricity to portable electronics. Given that motion associated with daily human activities can involve large amounts of reusable energy, biomechanical energy harvesting has received significant research attention. [10][11][12][13][14][15][16][17][18] Several portable biomechanical energy-harvesting platforms are available based on piezoelectric, electromagnetic, and triboelectric effects. They offer the promise of generating electricity for standalone electronics without the need for external wiring.Triboelectric energy harvesting, which is based on the combination of contact electrification between two different material surfaces and electrical induction, has been spotlighted as a promising technology due to material selection diversity, high efficiency, and shape adaptability. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Previous studies of triboelectric energy harvesters, also known as triboelectric nanogenerators (TENGs), have found that the only requirement for generating electricity through a TENG is sequential contact and separation of two different material surfaces, making the TENG a promising portable energy-harvesting platform. [35][36][37][38][39][40][41][42][43][44][45][46] In addition, the advantageous characteristics of the TENG enable it to be used for self-powered sensing applications. [47][48][49][50] The operating principle of a TENG is based on the presence of charges on the surface of the material rather than its volume, so the volumetric power density has the potential to be improved far more than is the case with other energy-harvesting platforms. So far, the most widely and frequently used method to increase the output power is to introduce micro/nanoscale topography on the surface of the TENG to generate a large amount of electrical charges during its operation. In addition to modification of the contact surface, intentional control of the kinematics of the contact layer movement by using mechanical components can improve performance substantially. Given that almost all biomechanical energy has the rare characteristics A triboelectric nanogenerator (TENG) is a promising energy harvester that exploits the combination of contact electrification between two different material surfaces and electrical induction. In this study, a handheld-TENG (HH-TENG) is developed to harvest biomechanical energy effectively, especially energy generated from finger motions, which is one of the most common body movements involving lots of energy. To enhance the electrical output performance of the device while minimizing the inconvenience caused by carrying it, a rationally designed lightweight power transmission unit is adopted. As a result, an extremely high number...

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Section: Introductionmentioning

confidence: 99%

Development of a High‐Performance Handheld Triboelectric Nanogenerator with a Lightweight Power Transmission Unit

Choi

Cho

Yun

et al. 2020

Adv Materials Technologies

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“…Many organizations have encouraged studies on energy harvesting technology, which converts various forms of renewable energies into electrical energy, due to the rapid depletion of fossil fuels, such as oil, coal, and natural gas [1]. Among various energy harvesters, the triboelectric nanogenerator (TENG), which generates electricity through coupling of triboelectrification between two different materials and resultant electric al induction, is attracting close attention in harvesting numerous abandoned energies, such as biomechanical energy, wind energy, and vibration energy [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The advantageous characteristics of TENG, such as high shape adaptability and accessibility and easy processability, make it a promising functional biomechanical energy harvester [5][6][7]13].…”

Section: Introductionmentioning

confidence: 99%

Facile Tailoring of Contact Layer Characteristics of the Triboelectric Nanogenerator Based on Portable Imprinting Device

Cho

Jang

et al. 2020

Materials

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Renewable energy harvesting technologies have been actively studied in recent years for replacing rapidly depleting energies, such as coal and oil energy. Among these technologies, the triboelectric nanogenerator (TENG), which is operated by contact-electrification, is attracting close attention due to its high accessibility, light weight, high shape adaptability, and broad applications. The characteristics of the contact layer, where contact electrification phenomenon occurs, should be tailored to enhance the electrical output performance of TENG. In this study, a portable imprinting device is developed to fabricate TENG in one step by easily tailoring the characteristics of the polydimethylsiloxane (PDMS) contact layer, such as thickness and morphology of the surface structure. These characteristics are critical to determine the electrical output performance. All parts of the proposed device are 3D printed with high-strength polylactic acid. Thus, it has lightweight and easy customizable characteristics, which make the designed system portable. Furthermore, the finger tapping-driven TENG of tailored PDMS contact layer with microstructures is fabricated and easily generates 350 V of output voltage and 30 μA of output current with a simple finger tapping motion-related biomechanical energy.

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“…They can be manufactured at low cost without any nanoprocessing, or performance can be enhanced by introducing nanopatterns on the tribosurfaces . Typically, the TENG output increases with increase in input force, and it is sensitive to changes in input frequency . Some studies have used the TENG sensitivity to frequency for sensor applications .…”

Section: Introductionmentioning

confidence: 99%

Design of Mechanical Frequency Regulator for Predictable Uniform Power from Triboelectric Nanogenerators

Bhatia

Lee

Hwang

et al. 2018

Advanced Energy Materials

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unpredictable. Finally, the unpredictability in converted electrical output makes it difficult to design circuits for optimal electrical energy storage and transforma tion. Thus, the entire performance of the energy scavenging power system is com promised if the problem of input mecha nical energy irregularity is not resolved.Triboelectric nanogenerators (TENG) can scavenge ambient mechanical vibra tion and rotation energy. They can be manufactured at low cost without any nanoprocessing, or performance can be enhanced by introducing nanopatterns on the tribosurfaces. [10,11] Typically, the TENG output increases with increase in input force, and it is sensitive to changes in input frequency. [12][13][14] Some studies have used the TENG sensitivity to frequency for sensor applica tions. [15][16][17] The input frequency also affects the TENG imped ance. [18,19] The optimal load capacitor for TENG energy storage is also frequency dependent. [20,21] In order to charge a battery, with low internal impedance, the inherent high impedance of the TENG must be reduced using a transformer. [18] Transformer conversion can lower TENG impedance, stepup the low TENG current, and stepdown the high TENG voltage. Using a trans former with the TENG can also enhance the rate of charging a large capacitor. [22][23][24] Transformers, however, are designed to operate optimally at specific frequencies. For example, iso lation transformers and power conversion transformers are designed to operate at 50/60 Hz to be compatible with the elec tric grid. [25] Thus, in order to use transformer with the TENG it is imperative to reliably regulate the TENG output frequency. Studies that have successfully employed the transformer with the TENG used highfrequency input conditions, which may not be consistently available especially when the mechanical input energy is irregular or low frequency. [18,19,[22][23][24] Therefore, by controlling the input forces and frequency acting on the TENG, first, the TENG internal impedance and output can be made predictable; second, sensible selection of load capacitor for direct charging is possible; and third, optimal use of trans former with the TENG for impedance matching, or voltage and current conversion is made possible.In this work, we introduce a mechanical frequency regulator (MFR) to obtain predictable uniform output from the TENG despite changes in the external input. First, handdriven input rotation energy of variable and low frequency was stored in a spiral spring (or mainspring). Then, the stored energy was Mechanical energy scavengers convert irregular input mechanical energy into irregular electrical output. There is a need to enable uniform and predictable electric output from energy scavengers regardless of the variability in the mechanical input. So, in this work, a mechanical frequency regulator is proposed that fixes the input forces and input frequency acting on a triboelectric nanogenerator, thus enabling predictable electric output. The irregular low frequency mechanical input energy is firs...

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Design and optimization of rotating triboelectric nanogenerator by water electrification and inertia

Cited by 97 publications

References 33 publications

Development of a High‐Performance Handheld Triboelectric Nanogenerator with a Lightweight Power Transmission Unit

Development of a High‐Performance Handheld Triboelectric Nanogenerator with a Lightweight Power Transmission Unit

Facile Tailoring of Contact Layer Characteristics of the Triboelectric Nanogenerator Based on Portable Imprinting Device

Design of Mechanical Frequency Regulator for Predictable Uniform Power from Triboelectric Nanogenerators

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