Wide-ranging impact-competent self-powered active sensor using a stacked corrugated-core sandwich-structured robust triboelectric nanogenerator

Yao

et al. 2017

Small

218

124

Cellulose is the most abundant natural polymer on earth, providing a sustainable green resource that is renewable, degradable, biocompatible and cost effective. Recently, nanocellulose-based mesoporous structure, flexible thin films, fibers, and networks are increasingly developed and used in photovoltaic devices, energy storage systems, mechanical energy harvesters, and catalysts components, showing tremendous materials science value and application potential in many energy-related fields. In this review article, we review the most recent advancements of processing, integration and application of cellulose nanomaterials in the areas of solar energy harvesting, energy storage, and mechanical energy harvesting. For solar energy harvesting, promising applications of cellulose-based nanostructures for both solar cells and photoelectrochemical electrodes development are reviewed, and their morphology-related merits are discussed. For energy storage, our discussion is primarily focused on the applications of cellulose-based nanomateriales in lithium ion batteries, including electrodes (e.g. active materials, binders and structural support), electrolytes, and separators. Applications of cellulose nanomaterials in supercapacitors are also overviewed briefly. For mechanical energy harvesting, we review the most recent technology evolution of cellulose-based triboelectric nanogenerators, from fundamental property tuning to practical implementations. At last, the future research potential and opportunities of cellulose nanomaterials as a new energy material are commented.

Section: Cellulose Nanomaterials For Nanogenerator Developmentsmentioning

confidence: 99%

Section: Cellulose Nanomaterials For Nanogenerator Developmentsmentioning

confidence: 99%

Cellulose‐Based Nanomaterials for Energy Applications

Yao

et al. 2017

Small

218

124

“…With this emerging idea, Wang presented an ew wayt ou se use skin-mounted energy harvesters to powering wearable and portable electronics. Uddin fabricated as tacked corrugated-core sandwichstructured TENG( CCS-TENG) [48] that had the ability to work under broad range of environmental conditions and could be used as as elf-powered active sensor. PET,p olyimide,a nd Al were used as the triboelectric surfaces in the PI-Al-PET-Al-PI corrugated core structure.T he performance of as ingle unit of CCS-TENG varied as the orientation (lengthwise/crosswise) of the TENG was changed among the sandwich plates.A tafixed frequency of 3Hz, the electrical outputs were observedt obehigher in the crosswise assembly (3.2-3.9 mA; 142-153 V) compared with the lengthwise assembly( 2.7-3.1 mA; 107-123 V) for the CCS-TENG.I twas also observed that the electrical outputsa td ifferent frequencies (3-10 Hz) and forces (3.0-10.1 N) were 142Vand 8.8-9.3 mAf or V OC and I SC ,r espectively,w hen the core diameters were varied.T his TENG wasu sed to effectively detect H 2 gas with ah igh responset ime (83 %) and it could be used as as elf-powereda ctive sensor, efficiently operating underv arious external impacts.…”

Section: Modes Of Operation 31 Vertical Contact Separation Modementioning

confidence: 99%

“…Therefore, mechanical energy is converted into electrical energy. There are various forms of relative motion in the movement of the TENG to harvest mechanical energy are vertical contact mode, lateral sliding mode, single electrode mode, and free standing triboelectric layer mode, as shown in Figure .…”

Section: Mechanisms Of Triboelectric Nanogeneratorsmentioning

confidence: 99%

Triboelectric Nanogenerators for Mechanical Energy Harvesting

Kaur

Pal

2018

Energy Tech

Energy is the essential requirement of daily life. Due to the diminution of the energy sources, it is necessary develop devices that can harvest the wasted energy that exists in the ambient environment. To address this, triboelectric nanogenerators (TENGs) have been developed as an innovative paradigm for energy harvesting. They can harvest the various forms of mechanical energy, including vibrations, walking, ocean waves, human motion, rain drops, flowing water, the motion of an automobile, wind, rotational energy, and mechanical triggering. TENGs can combine the contact electrification and electrostatic induction for energy conversion and operate on four fundamental modes for conversion of mechanical energy into electrical energy to power small‐scale electronics including mobile phones and sensors. The electrical outputs obtained from TENGs depend on the friction of materials that are selected from the triboelectric series on the basis of their electronegativity and electropositivity. Here, a comprehensive overview of the fundamentals of nanogenerators, various operating modes of TENGs and the design of devices that include them, and the performance improvement of this recently emerged technology is presented.

Advanced Energy Materials

“…Based on the coupling of triboelectrification effect and electrostatic induction, TENGs show excellent characteristics at low frequency and low amplitude, so they can convert ambient mechanical energy into electrical energy efficiently. [ 18–24 ] Researchers have investigated harvesting energy from the ocean, human motion, and vibration and wind in the environment. [ 25–28 ] Depending on its operating principle, the output characteristics of TENGs, especially the current, are determined by the external excitation.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Regulation Triboelectric Nanogenerator with Controllable Output Performance for Random Energy Harvesting

Yin

Qiao

et al. 2020

of energy collection. [1][2][3][4][5] However, ambient mechanical energy is characterized as having a wide range of operating frequencies, low amplitudes, randomness, and irregularity. [6][7][8] This sets a barrier for the mechanical energy collection for electromagnetic generators with weak performance in power generation at low frequencies. [9,10] In 2012, triboelectric nanogenerators (TENGs) with high power density, high energy conversion efficiency, and low costs were proposed by Wang's group, [11] which aroused comprehensive attention on the aspect of energy harvesting research. [12][13][14][15][16][17] Based on the coupling of triboelectrification effect and electrostatic induction, TENGs show excellent characteristics at low frequency and low amplitude, so they can convert ambient mechanical energy into electrical energy efficiently. [18][19][20][21][22][23][24] Researchers have investigated harvesting energy from the ocean, human motion, and vibration and wind in the environment. [25][26][27][28] Depending on its operating principle, the output characteristics of TENGs, especially the current, are determined by the external excitation. [29][30][31][32] However, the randomness and irregularity of energy from the environment results in an output performance of TENGs that is usually irregular and uncontrollable. [33,34] This has become one of the key problems restricting their applications.In the paper, the research philosophy of a mechanical regulation triboelectric nanogenerator (MR-TENG) with controllable output performance for harvesting random energy is proposed for the first time. Through the combination of the energy storage structure and the control switch structure, the controllable output of TENG under random excitation is achieved. The MR-TENG is made up of five main components: transmission unit, switch structure, generator unit which includes stator and rotor, flywheel, and shell. The structural transmission unit transfers random linear or rocking motions in the environment to the flywheel. The rotor of the generator unit fixed on the flywheel includes six flexible blades and a thin-walled cylinder. The stator of the generator unit includes a shell with 12 copper electrodes pasted equidistant on the inner wall of this shell. The rotor and stator cooperate to convert rotational kinetic Recycling of random mechanical energy in the environment has become an important research hotspot. The triboelectric nanogenerators (TENGs) were invented to harvest energy, and have been widely applied due to their simple structure, small size, and low cost. This paper reports a mechanical regulation triboelectric nanogenerator (MR-TENG) for the first time with controllable output performance used to harvest random or irregular energy in the environment. It comprises a transmission unit, switch structure, generator unit, flywheel, and shell. Random linear motion or rocking motion is transferred via the transmission unit to the flywheel. The rotor of the generator unit fixed on the flywheel and the stator of the gen...