Asymmetric permittivity enhanced bilayer polycaprolactone nanofiber with superior inner interfacial polarization and charge retention for high-output and humidity-resistant triboelectric nanogenerators

Zhong, Jixin; Hou, Xiaojuan; He, Jian; Xue, Feng; Yang, Yun; Chen, Liang; Yu, Junbin; Mu, Jiliang; Geng, Wenping; Chou, Xiujian

doi:10.1016/j.nanoen.2022.107289

Cited by 23 publications

(19 citation statements)

References 59 publications

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“…Similar explanations have also been reported. [ 41,42 ] ADE samples had a dielectric constant value higher than Ecoflex/BT films (Figure 2f). Compared with Ecoflex/BT, ADE had a slower decrease of the dielectric constant due to the dielectric properties of pure TPU.…”

Section: Resultsmentioning

confidence: 99%

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

Zhang

Chen

Xing

et al. 2023

Adv Materials Technologies

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Anisotropic actuation, a universal phenomenon in nature, may be inspiring for the development of intelligent soft robotics in the future. For dielectric elastomers (DEs), important investigations have been done to decrease the voltage and increase the actuation strain. However, mechanical isotropy of synthetic DEs shows in‐plane uniform deformation, lacking the controllability of the actuation direction. Herein, an anisotropic DE (denoted as ADE) is constructed by casting Ecoflex/BaTiO3 solution onto oriented TPU nanofibrous membranes fabricated via drum electrospinning. The resulting ADE with a seamless three‐layer structure features mechanical anisotropy in the elastic modulus, with the maximum ratio between x and y directions of the plane being 11. A prototype ADE‐based actuator demonstrates a high electroactuation anisotropy of 3.95, a large unidirectional length strain of 15%, and a high energy density of 0.014 MJ m−3 at an electric field of 40 V µm−1. Two potential applications, a flow divider valve simulating the Transwell test in the medical field and a mechanical stimulus component mimicking the maturation of cardiomyocytes, are successfully demonstrated. Thus, this work offers a versatile yet simple approach for fabricating anisotropic electroactive elastomer actuators in the future.

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Section: Resultsmentioning

confidence: 99%

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

Zhang

Chen

Xing

et al. 2023

Adv Materials Technologies

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“…[58] After years of research, researchers have developed a variety of organic polymer materials for making chargetrapping layers, such as PVDF, [263] PI, [264] PDMS, [57,265] IZO, [266] PS, [267] and PCL. [268] In 2018, Kim et al studied the effect of different thicknesses on the charge-trapping layer (Figure 14c), and they found that the thicker the charge-trapping layer, the greater charge storage capacity with more traps in the layer. The charge-trapping layer has a small number of charge traps and the trapped charges can easily combine the induced charges under a high electric field when charge-trapping layer is very thick.…”

Section: Charge-trapping Layer As Intermediate Layermentioning

confidence: 99%

“…[270,273] The carbon nanotubes (CNTs) were also used as a composite charge-trapping layer due to excellent charge-trapping properties, thus effectively enhanced the TENG output. [268,274,275] The charge-trapping layer is generally composed of polymers that contain more physical and chemical defects, for example residual polar groups, impurities doped in amorphous regions, crystal grid imperfections, amorphous free volume, crosslinking points, and other functional groups, with which charge trapping can be intensified. [41,276,277] For example, PS or PI have numerous charge trapping sites because of aromatic rings on the chains; PDMS has many charges trapped in the amorphous phase, the cross-linking networks and functional group; 2D materials features regulatable band gap and exclusive electrical characteristics of crystal structure.…”

Section: Charge-trapping Layer As Intermediate Layermentioning

confidence: 99%

“…[ 58 ] After years of research, researchers have developed a variety of organic polymer materials for making charge‐trapping layers, such as PVDF, [ 263 ] PI, [ 264 ] PDMS, [ 57,265 ] IZO, [ 266 ] PS, [ 267 ] and PCL. [ 268 ]…”

Section: Strategy Iii: the Inhibition Of Triboelectric Charge Drift A...mentioning

confidence: 99%

“…[ 270,273 ] The carbon nanotubes (CNTs) were also used as a composite charge‐trapping layer due to excellent charge‐trapping properties, thus effectively enhanced the TENG output. [ 268,274,275 ]…”

Section: Strategy Iii: the Inhibition Of Triboelectric Charge Drift A...mentioning

confidence: 99%

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An Advanced Strategy to Enhance TENG Output: Reducing Triboelectric Charge Decay

et al. 2023

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The Internet of Things (IoT) is poised to accelerate the construction of smart cities. However, it requires more than 30 billion sensors to realize the IoT vision, posing great challenges and opportunities for industries of self‐powered sensors. Triboelectric nanogenerator (TENG), an emerging new technology, is capable of easily converting energy from surrounding environment into electricity, thus TENG has tremendous application potential in self‐powered IoT sensors. At present, TENG encounters a bottleneck to boost output for large‐scale commercial use if just by promoting triboelectric charge generation, because the output is decided by the triboelectric charge dynamic equilibrium between generation and decay. To break this bottleneck, the strategy of reducing triboelectric charge decay to enhance TENG output is focused. First, multiple mechanisms of triboelectric charge decay are summarized in detail with basic theoretical principles for future research. Furthermore, recent advances in reducing triboelectric charge decay are thoroughly reviewed and outlined in three aspects: inhibition and application of air breakdown, simultaneous inhibition of air breakdown and triboelectric charge drift/diffusion, and inhibition of triboelectric charge drift/diffusion. Finally, challenges and future research focus are proposed. This review provides reference and guidance for enhancing TENG output.

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Humidity‐Resistant Triboelectric Nanogenerator Based on a Swelling‐Resistant and Antiwear PAN/PVA‐CaCl₂ Composite Film for Seawater Desalination

Yang,

Zhang,

Wang

et al. 2023

Adv Funct Materials

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Atmospheric moisture accelerates the triboelectric charge transport and dissipation in the triboelectric nanogenerator (TENG). However, the output of polyvinyl alcohol (PVA)‐based humidity‐resistant TENG is still limited under high humidity and suffers from the swelling problem in practical application. In this paper, a swelling‐ and humidity‐resistant high‐performance TENG using a polyacrylonitrile/polyvinyl alcohol‐calcium chloride (PAN/PVA‐CaCl2) composite film (PPCa‐TENG) is designed for seawater desalination. The PAN/PVA‐CaCl2 composite films exhibit superior water uptake speed, swelling resistance, and mechanical and tribological properties compared with other prepared membranes at high relative humidity (RH). The maximum short‐circuit current (Isc) and output voltage (Vo) of the PPCa‐TENG can reach 52.04 µA and 941 V at 75% RH, respectively, with increasing the power of PVA‐based TENG by about 17.39 times. The Kelvin probe force microscopy (KPFM) results suggest that the PAN/PVA‐CaCl2 composite film demonstrates a higher tribopositivity. Furthermore, the PPCa‐TENG is applied as an effective, economical power source for seawater desalination, with an energy consumption of only 0.19 kWh m−3. This number is remarkably lower than that of desalination powered by conventional direct‐current power supplies reported in previous work. This paper provides a feasible, effective method for the design of the TENG with high performance under high‐humidity conditions.

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Asymmetric permittivity enhanced bilayer polycaprolactone nanofiber with superior inner interfacial polarization and charge retention for high-output and humidity-resistant triboelectric nanogenerators

Cited by 23 publications

References 59 publications

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

An Advanced Strategy to Enhance TENG Output: Reducing Triboelectric Charge Decay

Humidity‐Resistant Triboelectric Nanogenerator Based on a Swelling‐Resistant and Antiwear PAN/PVA‐CaCl₂ Composite Film for Seawater Desalination

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Asymmetric permittivity enhanced bilayer polycaprolactone nanofiber with superior inner interfacial polarization and charge retention for high-output and humidity-resistant triboelectric nanogenerators

Cited by 23 publications

References 59 publications

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

An Anisotropic Dielectric Elastomer Actuator with an Oriented Electrospun Nanofiber Composite Film

An Advanced Strategy to Enhance TENG Output: Reducing Triboelectric Charge Decay

Humidity‐Resistant Triboelectric Nanogenerator Based on a Swelling‐Resistant and Antiwear PAN/PVA‐CaCl2 Composite Film for Seawater Desalination

Contact Info

Product

Resources

About

Humidity‐Resistant Triboelectric Nanogenerator Based on a Swelling‐Resistant and Antiwear PAN/PVA‐CaCl₂ Composite Film for Seawater Desalination