Model of electric charge distribution in the trap of a close-contact TENG system

AbstractElectron propagation in a trapped state between an insulator and a metal during very close contact in a triboelectric nanogenerator (TENG) system was considered in this study. A single energy level (E0) was assumed for the trap and wave function inside the trap, which is related to the ground state energy. The phase of the waveform in the metal (neglecting the rebound effect at the wall) was assumed very small (δ′ ≪ 1) because of the large size of the metal. The contact distance between the trap and metal is very small, which allows us to ignore the vacuum potential. Based on our results, the probability of finding an electron inside the trap as a function of time was found to be in oscillation (i.e., back-and-forth propagation of the electron between the trap and metal leads to an equilibrium state). These results can be used to understand the quantum mechanisms of continuous contact, particularly in sliding-mode TENG systems.

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Close contact distance between hexacyanometallate ions in the course of electron transfer

Mendeleev Communications ◽

10.1070/mc1999v009n05abeh001138 ◽

1999 ◽

Vol 9 (5) ◽

pp. 181-182 ◽

Cited By ~ 5

Author(s):

Vitalii Yu. Kotov ◽

Galina A. Tsirlina

Keyword(s):

Electron Transfer ◽

Close Contact ◽

Contact Distance

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Triboelectric Nanogenerator: Lateral Sliding Mode

Triboelectric Nanogenerators - Green Energy and Technology ◽

10.1007/978-3-319-40039-6_3 ◽

2016 ◽

pp. 49-90 ◽

Cited By ~ 2

Author(s):

Zhong Lin Wang ◽

Long Lin ◽

Jun Chen ◽

Simiao Niu ◽

Yunlong Zi

Keyword(s):

Sliding Mode ◽

Triboelectric Nanogenerator

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Three-dimensional modeling of alternating current triboelectric nanogenerator in the linear sliding mode

Applied Physics Reviews ◽

10.1063/1.5133023 ◽

2020 ◽

Vol 7 (1) ◽

pp. 011405 ◽

Cited By ~ 4

Author(s):

Jiajia Shao ◽

Di Liu ◽

Morten Willatzen ◽

Zhong Lin Wang

Keyword(s):

Sliding Mode ◽

Three Dimensional ◽

Alternating Current ◽

Triboelectric Nanogenerator ◽

Three Dimensional Modeling ◽

Dimensional Modeling

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Study on friction-electrification coupling in sliding-mode triboelectric nanogenerator

Nano Energy ◽

10.1016/j.nanoen.2018.04.007 ◽

2018 ◽

Vol 48 ◽

pp. 456-463 ◽

Cited By ~ 26

Author(s):

Weiqiang Zhang ◽

Dongfeng Diao ◽

Kun Sun ◽

Xue Fan ◽

Pengfei Wang

Keyword(s):

Sliding Mode ◽

Triboelectric Nanogenerator

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Validation of an Atomistic Field Theory for Contact Electrification Using a MEMS Load Cell

Volume 10: Micro- and Nano-Systems Engineering and Packaging ◽

10.1115/imece2019-11349 ◽

2019 ◽

Author(s):

Tyler J. Hieber ◽

Mohamad Ibrahim Cheikh ◽

James M. Chen ◽

Zayd C. Leseman

Keyword(s):

Field Theory ◽

High Speed ◽

Sliding Mode ◽

Close Contact ◽

Michelson Interferometer ◽

Load Cell ◽

Cell Stiffness ◽

Contact Potential ◽

Aft Model ◽

Contact Electrification

Abstract This work depicts an experimental method for the validation of an Atomistic Field Theory (AFT) model for contact electrification of dielectrics. The AFT model is used to simulate the effects of Triboelectric Nanogenerators (TENGs) for energy harvesting. Recently, the AFT model has shown that contact electrification can be described by the induced surface dipoles when two dissimilar materials are brought into close contact assuming that the crystal lattices are free of defects, no residual strain in the materials is present and that the experiment is performed in vacuum. These simulations have been used to predict the induced contact potential between MgO and BaTiO3. To validate the AFT model, a set of quasi-static experiments will be conducted to test two different operating modes of TENGs, which can be mirrored in the simulations. The first experiment is a micro-scale pull-in/pull-off test in which a pad of single crystal Si (SCSi) will be brought into and out of contact with a dielectric substrate (thermally grown SiO2). The second experiment will mimic the TENG during sliding operation. A SCSi microcantilever will be brought into contact with the dielectric surface and displaced in sliding mode. These experiments will be conducted using a custom, reusable MEMS load cell and an electrometer to monitor the interaction forces and induced charge on the surfaces. To obtain the required displacement resolution of the load cell, a high-speed Michelson interferometer will be used. This allows for higher load cell stiffness to accommodate for surface adhesion effects. The load cell will be calibrated using the well-known technique of hanging masses from the load cell. The relative distance between the interacting surfaces in both experiments will be controlled by a piezo stage with 1 nm resolution. Results from these experiments are to be compared to the AFT model results.

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Boosting output performance of sliding mode triboelectric nanogenerator by charge space-accumulation effect

Nature Communications ◽

10.1038/s41467-020-18086-4 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 6

Author(s):

Wencong He ◽

Wenlin Liu ◽

Jie Chen ◽

Zhao Wang ◽

Yike Liu ◽

...

Keyword(s):

Charge Density ◽

Sliding Mode ◽

Mechanical Energy ◽

Low Frequency ◽

Deep Understanding ◽

Triboelectric Nanogenerator ◽

Ambient Conditions ◽

Output Performance ◽

Charge Space ◽

Air Breakdown

Abstract The sliding mode triboelectric nanogenerator (S-TENG) is an effective technology for in-plane low-frequency mechanical energy harvesting. However, as surface modification of tribo-materials and charge excitation strategies are not well applicable for this mode, output performance promotion of S-TENG has no breakthrough recently. Herein, we propose a new strategy by designing shielding layer and alternative blank-tribo-area enabled charge space-accumulation (CSA) for enormously improving the charge density of S-TENG. It is found that the shielding layer prevents the air breakdown on the interface of tribo-layers effectively and the blank-tribo-area with charge dissipation on its surface of tribo-material promotes charge accumulation. The charge space-accumulation mechanism is analyzed theoretically and verified by experiments. The charge density of CSA-S-TENG achieves a 2.3 fold enhancement (1.63 mC m−2) of normal S-TENG in ambient conditions. This work provides a deep understanding of the working mechanism of S-TENG and an effective strategy for promoting its output performance.

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