Triboelectric Energy Harvesters

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 9636

Special Issue Editors


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Guest Editor
School of Engineering, Ulster University, Belfast BT37 0QB, Northern Ireland, UK
Interests: energy harvesting; energy storage sensors; plasma processing; bio-sensors; energy systems
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Guest Editor
Department of Electrical, Electronic & Computer Engineering, University of Pretoria, Pretoria 0002, South Africa
Interests: printed electronics; microsystems and microfluidics; point-of-care health and environmental diagnostics

Special Issue Information

Dear Colleagues,

Triboelectric nanogenerators (TENGs) are the foremost contenders for enabling self-powered applications, utilising contact electrification and Maxwell’s displacement current law as the basis for energy harvesting. The conversion of low-frequency, low-impact ubiquitous mechanical energy to electrical output at high efficiencies in a simple design has driven varied and exciting research approaches leading to high power densities, currently of the order of hundreds of Watts per square metre. Consequently, we are currently witnessing varied and exciting research approaches for developing still higher power density and efficient TENGs. Applications range from environmental to point-of-care health diagnostics and body-worn energy harvesters, and encompass self-powered structural sensors to stand-alone devices for monitoring key parameters. Thin, flexible TENGs have been realized using paper and other low-cost commodity polymer materials to further expand the applications of these devices.

In this Special Issue of Micromachines, we invite authors to submit original communications, articles, and review papers which cover the breadth of research, development, and applications of TENGs. Collectively the Issue will seek to address fundamental, technological and application aspects to facilitate the next stage of development of TENG technology.

Dr. Navneet Soin
Dr. Suzanne Smith
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • triboelectric nanogenerators (TENGs)
  • flexible TENGs
  • applications of TENGs

Published Papers (3 papers)

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Research

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12 pages, 2985 KiB  
Article
Simulation Guided Hand-Driven Portable Triboelectric Nanogenerator: Design, Optimisation, and Evaluation
by Yunzhong Wang, Anh Tran Tam Pham, Damian Tohl and Youhong Tang
Micromachines 2021, 12(8), 955; https://doi.org/10.3390/mi12080955 - 12 Aug 2021
Cited by 4 | Viewed by 2590
Abstract
Inspired by the fundamental mechanics of an ancient whirligig (or buzzer toy; 3300 BC), a hand-driven rotational triboelectric nanogenerator (HDR-TENG) was designed and optimised, guided by our recently reported mathematical modelling. This modelling indicates that the power generated by HDR-TENG is a function [...] Read more.
Inspired by the fundamental mechanics of an ancient whirligig (or buzzer toy; 3300 BC), a hand-driven rotational triboelectric nanogenerator (HDR-TENG) was designed and optimised, guided by our recently reported mathematical modelling. This modelling indicates that the power generated by HDR-TENG is a function of the number of segments, rotational speed, and tribo-surface spacing with different weighting sensitivities. Based on the simulation results, additive manufacturing technology was combined with commercially available components to cost-effectively fabricate the HDR-TENG. The fabricated HDR-TENG can provide stable and adjustable rotational speed up to 15,000 rpm with a linear hand stretching. The output voltage of HDR-TENG maintains a constant value within 50,000 cycles of testing when using Nylon 66 and PTFE as the triboelectric material. It can charge a 47 μF capacitor to 2.2 V in one minute. This study provides a cost-effective portable HDR-TENG device with adjustable high rotational speed, high power output, and long durable life, creating opportunities to provide a power supply for point-of-care devices in remote or resource-poor settings and applications in science and engineering education. Full article
(This article belongs to the Special Issue Triboelectric Energy Harvesters)
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12 pages, 2699 KiB  
Article
Design and Optimization Principles of Cylindrical Sliding Triboelectric Nanogenerators
by Zhike Xia, Pei-Yong Feng, Xin Jing, Heng Li, Hao-Yang Mi and Yuejun Liu
Micromachines 2021, 12(5), 567; https://doi.org/10.3390/mi12050567 - 17 May 2021
Cited by 8 | Viewed by 2866
Abstract
Reciprocating motion is a widely existing form of mechanical motion in the natural environment. Triboelectric nanogenerators (TENGs) that work in sliding mode are ideal for harnessing large-distance reciprocating motion, and their energy conversion efficiency could be greatly enhanced by adding springs to them. [...] Read more.
Reciprocating motion is a widely existing form of mechanical motion in the natural environment. Triboelectric nanogenerators (TENGs) that work in sliding mode are ideal for harnessing large-distance reciprocating motion, and their energy conversion efficiency could be greatly enhanced by adding springs to them. Herein, we focused on investigating the design and optimization principles of sliding mode TENGs by analyzing the effects of spring parameters and vibration frequency on the triboelectric output performance of typical cylindrical sliding TENGs (CS-TENGs). Experimental study and finite elemental analysis were carried out based on a CS-TENG model assembled using a polytetrafluoroethylene (PTFE) film as the negative layer and an aluminum film as the positive layer. The energy output was found to be mainly affected by the change of relative displacement between the two friction layers, rather than the reactive force applied by the springs or the velocity of the sliding motion. However, the frequency of the output signals could be improved when the stiffness coefficient of the springs and the CS-TENG vibration frequency were increased. This study provides valuable directions for the design and optimization of sliding mode TENGs containing springs, and will motivate in-depth research on the fundamental principles of TENG operation. Full article
(This article belongs to the Special Issue Triboelectric Energy Harvesters)
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Review

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36 pages, 3685 KiB  
Review
Triboelectric Effect Enabled Self-Powered, Point-of-Care Diagnostics: Opportunities for Developing ASSURED and REASSURED Devices
by Navneet Soin, Sam J. Fishlock, Colin Kelsey and Suzanne Smith
Micromachines 2021, 12(3), 337; https://doi.org/10.3390/mi12030337 - 22 Mar 2021
Cited by 12 | Viewed by 3414
Abstract
The use of rapid point-of-care (PoC) diagnostics in conjunction with physiological signal monitoring has seen tremendous progress in their availability and uptake, particularly in low- and middle-income countries (LMICs). However, to truly overcome infrastructural and resource constraints, there is an urgent need for [...] Read more.
The use of rapid point-of-care (PoC) diagnostics in conjunction with physiological signal monitoring has seen tremendous progress in their availability and uptake, particularly in low- and middle-income countries (LMICs). However, to truly overcome infrastructural and resource constraints, there is an urgent need for self-powered devices which can enable on-demand and/or continuous monitoring of patients. The past decade has seen the rapid rise of triboelectric nanogenerators (TENGs) as the choice for high-efficiency energy harvesting for developing self-powered systems as well as for use as sensors. This review provides an overview of the current state of the art of such wearable sensors and end-to-end solutions for physiological and biomarker monitoring. We further discuss the current constraints and bottlenecks of these devices and systems and provide an outlook on the development of TENG-enabled PoC/monitoring devices that could eventually meet criteria formulated specifically for use in LMICs. Full article
(This article belongs to the Special Issue Triboelectric Energy Harvesters)
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