The role of intermolecular forces in contact electrification on polymer surfaces and triboelectric nanogenerators

Šutka, Andris; Mālnieks, Kaspars; Lapčinskis, Linards; Kaufelde, Paula; Linarts, Artis; Bērziņa, Astrīda; Zabels, R.; Jurķāns, Vilnis; Gorņevs, Ilgvars; Blūms, Juris; Knite, Māris

doi:10.1039/c9ee01078e

Cited by 80 publications

(82 citation statements)

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“…During the motion process (sliding or separation), opposite charges on the surface of materials are produced, whose amount will significantly increase if the surface area increases and changes according to the different composition and structure of materials [24,25]. Several studies have been conducted to understand the charge formation mechanisms, and they also provided the basis for measurements standards [26][27][28]. In another work, Zou et al [29] demonstrated how to measure triboelectricity by using several polymers as examples.…”

Section: Introductionmentioning

confidence: 99%

Natural and Eco-Friendly Materials for Triboelectric Energy Harvesting

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Section: Introductionmentioning

confidence: 99%

Natural and Eco-Friendly Materials for Triboelectric Energy Harvesting

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“…ontact electrification (CE) (or triboelectrification in general terms) is a universal but complicated phenomenon, which has been known for more than 2600 years. The solid-solid CE has been studied using various methods and different mechanisms were proposed (Electron transfer 1,2 , ion transfer 3 and material transfer [4][5][6] were used to explain different types of CE phenomena for various materials). In parallel, CE between liquid-solid is rather ubiquitous in our daily life, such as flowing water out of a pipe is charged, which is now the basis of many technologies and physical chemical phenomena, such as the liquid-solid triboelectric nanogenerators (TENGs) [7][8][9][10] , hydrophobic and hydrophilic surfaces, and the formation of electric double-layer (EDL) [11][12][13][14] .…”

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Quantifying electron-transfer in liquid-solid contact electrification and the formation of electric double-layer

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Contact electrification (CE) has been known for more than 2600 years but the nature of charge carriers and their transfer mechanisms still remain poorly understood, especially for the cases of liquid-solid CE. Here, we study the CE between liquids and solids and investigate the decay of CE charges on the solid surfaces after liquid-solid CE at different thermal conditions. The contribution of electron transfer is distinguished from that of ion transfer on the charged surfaces by using the theory of electron thermionic emission. Our study shows that there are both electron transfer and ion transfer in the liquid-solid CE. We reveal that solutes in the solution, pH value of the solution and the hydrophilicity of the solid affect the ratio of electron transfers to ion transfers. Further, we propose a two-step model of electron or/and ion transfer and demonstrate the formation of electric double-layer in liquid-solid CE.

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“…[3,4] In contrast, triboelectricity is a fundamental property that arises from contact between two dissimilar materials causing opposing charges to form on each surface, called contact electrification (CE). [5][6][7][8] In PEGs, CE can result from friction at polymer interfaces, shear forces in composites, and even friction or static discharge from a human finger or rubber glove (both commonly used to test PEGs). Without consideration of CE the electrical output arising from the reported piezoelectric effect is often inflated.…”

Section: Introductionmentioning

confidence: 99%

Measuring Piezoelectric Output—Fact or Friction?

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Piezoelectric polymers are emerging as exceptionally promising materials for energy harvesting.While the theoretical figures of merit for piezoelectric polymers are comparable to ceramics, the measurement techniques need to be retrofitted to account for the different mechanical properties of the softer polymeric materials. Here, how contact electrification is often mistaken for piezoelectric charge is discussed, through friction and contact separation, and a perspective for how to separate these effects is provided. The state of the literature is assessed, and recommendations are made for This article is protected by copyright. All rights reserved.clear and simple guidelines in reporting, for both sample geometry and testing methods, to enable accurate determination of piezoelectric figures of merit in polymers. Such improvements will allow an understanding of what types of material manipulation are required in order to enhance the piezoelectric output from polymers and enable the next generation of polymer energy harvester design.

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The role of intermolecular forces in contact electrification on polymer surfaces and triboelectric nanogenerators

Abstract: The present study reports the origin of surface charge on the polymer surface upon triboelectrification and is a step forward towards the development of next generation of mechanical energy harvesting systems.

Cited by 80 publications

References 17 publications

Natural and Eco-Friendly Materials for Triboelectric Energy Harvesting

Natural and Eco-Friendly Materials for Triboelectric Energy Harvesting

Quantifying electron-transfer in liquid-solid contact electrification and the formation of electric double-layer

Measuring Piezoelectric Output—Fact or Friction?

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