Highly Efficient Raindrop Energy-Based Triboelectric Nanogenerator for Self-Powered Intelligent Greenhouse

Zhang, Qi; Jiang, Chengmei; Li, Xunjia; Dai, Shufen; Ying, Yibin; Ping, Jianfeng

doi:10.1021/acsnano.1c04258

Cited by 139 publications

(86 citation statements)

References 50 publications

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“…[22,23] As a result, most droplet electricity generators (DEG) still utilize traditional electrostatic induction (TEI) for their output, and the performance is severely constrained. Therefore, previous studies deem that the output of DEG is limited by the interfacial effect between the solid and liquid, [24][25][26][27][28][29] however, we do not agree with this view. Owing to the different characteristics between the solid-solid interface and the solidliquid interface, it is unsuitable to mechanically apply the TEI model of solid-solid case to solid-liquid electricity generator.…”

Section: Introductioncontrasting

confidence: 99%

A Single‐Droplet Electricity Generator Achieves an Ultrahigh Output Over 100 V Without Pre‐Charging

Zhang

Cai

et al. 2021

Advanced Materials

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various scattered and irregular energy sources in the natural environment. [10] Although this type of energy is small, it is distributed extremely widely. If utilized reasonably, it will certainly make a significant contribution to human energy strategy.Coupled with contact electrification and electrostatic induction, Prof. Wang's group first invented the triboelectric nanogenerator (TENG) in 2012. [11] Presently, as the mainstream technology for energy harvesting, TENG has shown great application prospects in the fields of micro-nano energy, self-powered system, and blue energy due to its environmental friendliness, high efficiency, and accessibility. [12][13][14][15] After decades of research, the theory and output of TENG based on solid-solid interface has been deeply explored and improved. [16][17][18] However, in addition to the mechanical energy-electricity conversion between the solidsolid interface, the triboelectricity at solid-liquid interface can also be seen everywhere in the environment, such as in the falling raindrops. [19] Recently, the mechanism of solid-liquid electrification has been explored, and theories such as the electric-double-layer model and Wang's hybrid layer model have also been proposed to expand its applications. [20,21] However, these works of research are mainly concentrated on the solid-liquid electrificationThe working principle of the triboelectric nanogenerator (TENG), contact electrification and electrostatic induction, has been used to harvest raindrop energy in recent years. However, the existing research is mainly concentrated on solid-liquid electrification, and adopts traditional electrostatic induction (TEI) for output. As a result, the efficiency of droplet electricity generators (DEGs) is severely constrained. Therefore, previous studies deem that the DEG output is limited by interfacial effects. This study reveals that this view is inappropriate and, in reality, the output strategy is the key bottleneck restricting the DEG performance. Here, a switch effect based on an electricdouble-layer capacitor (EDLC) is introduced, and an equivalent circuit model is established to understand its working mechanism. Without pre-charging, a single droplet can generate high voltage over 100 V and the output is directly improved by two-orders of magnitude compared with TEI, which is precisely utilizing the interfacial effect. This work provides insightful perspective and lays solid foundation for DEG applications in large scale.

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Section: Introductioncontrasting

confidence: 99%

A Single‐Droplet Electricity Generator Achieves an Ultrahigh Output Over 100 V Without Pre‐Charging

Zhang

Cai

et al. 2021

Advanced Materials

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“…The phenomenon of surface electrification upon contact has been documented for over 2600 years, and many applications have been developed based on this phenomenon. − Since 2012, the triboelectric nanogenerator (TENG) proposed by Wang, which uses the coupling of contact electrification and electrostatic induction to generate electrical energy, has been a further understanding of the mechanism of frictional power and gradually developing as one technology in the field of energy harvesting. − The operation of a TENG mainly relies on the interfacial electrostatic field, which outputs power due to the displacement current induced by mechanical motion. − So far, TENGs can harvest energy from tribo-contacts at the solid-solid interface, − solid-liquid interface, − liquid-liquid interface, , and even solid-gas interface, while the applications of TENGs have also been successfully developed in many areas, including micro/nano power source, − self-powered sensors, − blue energy harvester, − and high-voltage sources. − However, little progress has been proposed related to energy generation at the liquid-gas (L-G) interface. It is commonly known that lightning on rainy days and lightning of dressing coats are the results of triboelectricity, which can be an undeveloped energy source.…”

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confidence: 99%

Study of Contact Electrification at Liquid-Gas Interface

et al. 2021

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It is known that the suspended liquid droplets in clouds can generate electrostatic charges, which finally results in the lightning. However, the detailed mechanism related to the contact-electrification process on the liquid-gas (L-G) interfaces is still poorly understood. Here, by introducing an acoustic levitation method for levitating a liquid droplet, we have studied the electrification mechanism at the L-G interface. The tribo-motion between water droplets and air induced by the ultrasound wave leads to the generation of positive charges on the surface of the droplets, and the charge amount of water droplets (20 μL) gradually reaches saturation within 30 s. The mixed solid particles in droplets can increase the amount of transferred charge, whereas the increase of ion concentration in the droplet can suppress the charge generation. This charge transfer phenomenon at L-G interfaces and the related analysis can be a guidance for the study in many fields, including anti-static, harvesting rainy energy, micro/nano fluidics, triboelectric power generator, surface engineering, and so on. Moreover, the surface charge generation due to L-G electrification is an inevitable effect during ultrasonic levitation, and thus, this study can also work for the applications of the ultrasonic technique.

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“…Rain is a major source of fresh water for human beings and other terrestrial organisms [1][2][3][4][5][6][7][8] . The rain gauge is a significant device for rainfall monitoring that is usually employed in unattended environments and requires a long service life.…”

Section: Introductionmentioning

confidence: 99%

Raindrop energy-powered autonomous wireless hyetometer based on liquid–solid contact electrification

et al. 2022

Microsyst Nanoeng

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Triboelectric nanogenerators (TENGs) can directly harvest energy via solid–liquid interface contact electrification, making them very suitable for harvesting raindrop energy and as active rainfall sensors. This technology is promising for realizing a fully self-powered system for autonomous rainfall monitoring combined with energy harvesting/sensing. Here, we report a raindrop energy-powered autonomous rainfall monitoring and wireless transmission system (R-RMS), in which a raindrop-TENG (R-TENG) array simultaneously serves as a raindrop energy harvester and rainfall sensor. At a rainfall intensity of 71 mm/min, the R-TENG array can generate an average short-circuit current, open-circuit voltage, and maximum output power of 15 μA, 1800 V, and 325 μW, respectively. The collected energy can be adjusted to act as a stable 2.5 V direct-current source for the whole system by a power management circuit. Meanwhile, the R-TENG array acts as a rainfall sensor, in which the output signal can be monitored and the measured data are wirelessly transmitted. Under a rainfall intensity of 71 mm/min, the R-RMS can be continuously powered and autonomously transmit rainfall data once every 4 min. This work has paved the way for raindrop energy-powered wireless hyetometers, which have exhibited broad prospects in unattended weather monitoring, field surveys, and the Internet of Things.

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Highly Efficient Raindrop Energy-Based Triboelectric Nanogenerator for Self-Powered Intelligent Greenhouse

Cited by 139 publications

References 50 publications

A Single‐Droplet Electricity Generator Achieves an Ultrahigh Output Over 100 V Without Pre‐Charging

A Single‐Droplet Electricity Generator Achieves an Ultrahigh Output Over 100 V Without Pre‐Charging

Study of Contact Electrification at Liquid-Gas Interface

Raindrop energy-powered autonomous wireless hyetometer based on liquid–solid contact electrification

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