scholarly journals Rationally patterned electrode of direct-current triboelectric nanogenerators for ultrahigh effective surface charge density

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhihao Zhao ◽  
Yejing Dai ◽  
Di Liu ◽  
Linglin Zhou ◽  
Shaoxin Li ◽  
...  

AbstractAs a new-era of energy harvesting technology, the enhancement of triboelectric charge density of triboelectric nanogenerator (TENG) is always crucial for its large-scale application on Internet of Things (IoTs) and artificial intelligence (AI). Here, a microstructure-designed direct-current TENG (MDC-TENG) with rationally patterned electrode structure is presented to enhance its effective surface charge density by increasing the efficiency of contact electrification. Thus, the MDC-TENG achieves a record high charge density of ~5.4 mC m−2, which is over 2-fold the state-of-art of AC-TENGs and over 10-fold compared to previous DC-TENGs. The MDC-TENG realizes both the miniaturized device and high output performance. Meanwhile, its effective charge density can be further improved as the device size increases. Our work not only provides a miniaturization strategy of TENG for the application in IoTs and AI as energy supply or self-powered sensor, but also presents a paradigm shift for large-scale energy harvesting by TENGs.

2020 ◽  
Author(s):  
Zhihao Zhao ◽  
Yejing Dai ◽  
Di Liu ◽  
Linglin Zhou ◽  
Shaoxin Li ◽  
...  

Abstract As a new-era of energy harvesting technology, triboelectric nanogenerator (TENG) has been invented to convert randomly distributed mechanical energy into electric power for Internet of Things (IoTs) and artificial intelligence (AI) applications. Enhancement of the triboelectric charge density is crucial for its large-scale commercialization. Here, a microstructure-designed direct-current TENG (MDC-TENG) with rationally patterned electrode structure is presented to enhance its effective surface charge density by increasing the efficiency of contact electrification, which achieves a record high charge density of ~5.4 mC m-2 (more than 2 times of the best value reported). The MDC-TENG realizes both the miniaturized device and high output performance. Meanwhile, its effective charge density can be further improved as the device size increases. Our work not only provides a miniaturization strategy of TENG for the application in IoTs and AI as energy supply or self-powered sensor, but also presents a paradigm shift of the large-scale energy harvesting by TENGs.


Nanoscale ◽  
2017 ◽  
Vol 9 (27) ◽  
pp. 9668-9675 ◽  
Author(s):  
Jia Jia Shao ◽  
Wei Tang ◽  
Tao Jiang ◽  
Xiang Yu Chen ◽  
Liang Xu ◽  
...  

A multi-dielectric-layered vertical contact-separation mode TENG through a corona discharge approach results in outstanding output performances, i.e., a high surface charge density of 283 μC m−2 and excellent cycling stability (92.6% retention after 200 000 cycles).


2020 ◽  
Author(s):  
Bolang Cheng ◽  
Qi Xu ◽  
Yaqin Ding ◽  
Suo Bai ◽  
Xiaofeng Jia ◽  
...  

Abstract Usually, high temperature decreases the output performance of triboelectric nanogenerator (TENG) because of the dissipation of triboelectric charges through the thermionic emission. It would be highly valuable if the high temperature can be used to enhance the output performance of TENG. In this paper, through a simulation combining the electron-cloud-potential-well model for triboelectrification and the thermionic-emission model, we find that there exists an optimum temperature difference ∆T between friction layers under which the output of TENG is maximum. Based on this, a type of contact-separation temperature difference TENG with controllable friction layer temperature (TDNG) is designed and fabricated to enhance the electrical output performance in temperature difference environment. As the temperature difference ∆T increasing from 0 K to 145 K, the output voltage, current, the surface charge density and output power are increased 2.7, 2.2, 3.0 and 2.9 times, respectively (from 315 V, 9.1 μA, 47 nC/m2, 69 μW to 858 V, 20 μA, 0.14 μC/m2, 206.7 μW). Then with the continuous increase of ∆T to 219 K, the surface charge density and output performance gradually decrease. At the optimal temperature difference (145 K), the biggest output current density (396 μA/cm2) has been obtained, which is 13% larger than the reported record value (350 μA/cm2).


Author(s):  
Lu Liu ◽  
Linglin Zhou ◽  
Chuguo Zhang ◽  
Zhihao Zhao ◽  
Shaoxin Li ◽  
...  

Triboelectric nanogenerator (TENG) has been demonstrated as a revolutionary energy-harvesting technology toward distributed energy sources and self-powered systems, however, its output performance is significantly affected by humidity, which seriously limits...


2014 ◽  
Vol 176 ◽  
pp. 447-458 ◽  
Author(s):  
Zhong Lin Wang

Triboelectrification is one of the most common effects in our daily life, but it is usually taken as a negative effect with very limited positive applications. Here, we invented a triboelectric nanogenerator (TENG) based on organic materials that is used to convert mechanical energy into electricity. The TENG is based on the conjunction of triboelectrification and electrostatic induction, and it utilizes the most common materials available in our daily life, such as papers, fabrics, PTFE, PDMS, Al, PVCetc.In this short review, we first introduce the four most fundamental modes of TENG, based on which a range of applications have been demonstrated. The area power density reaches 1200 W m−2, volume density reaches 490 kW m−3, and an energy conversion efficiency of ∼50–85% has been demonstrated. The TENG can be applied to harvest all kinds of mechanical energy that is available in our daily life, such as human motion, walking, vibration, mechanical triggering, rotation energy, wind, a moving automobile, flowing water, rain drops, tide and ocean waves. Therefore, it is a new paradigm for energy harvesting. Furthermore, TENG can be a sensor that directly converts a mechanical triggering into a self-generated electric signal for detection of motion, vibration, mechanical stimuli, physical touching, and biological movement. After a summary of TENG for micro-scale energy harvesting, mega-scale energy harvesting, and self-powered systems, we will present a set of questions that need to be discussed and explored for applications of the TENG. Lastly, since the energy conversion efficiencies for each mode can be different although the materials are the same, depending on the triggering conditions and design geometry. But one common factor that determines the performance of all the TENGs is the charge density on the two surfaces, the saturation value of which may independent of the triggering configurations of the TENG. Therefore, the triboelectric charge density or the relative charge density in reference to a standard material (such as polytetrafluoroethylene (PTFE)) can be taken as a measuring matrix for characterizing the performance of the material for the TENG.


2012 ◽  
Vol 116 (8) ◽  
pp. 4993-4998 ◽  
Author(s):  
Gaoxing Su ◽  
Hongyu Zhou ◽  
Qingxin Mu ◽  
Yi Zhang ◽  
Liwen Li ◽  
...  

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