Triboelectric Nanogenerators Ocean Wave Energy Harvesting

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Triboelectric Nanogenerators Ocean Wave Energy Harvesting ( triboelectric-nanogenerators-ocean-wave-energy-harvesting )

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Proceedings Water-Dielectric Single Electrode Mode Triboelectric Nanogenerators for Ocean Wave Impact Energy Harvesting † Ulises Tronco Jurado 1,2,*, Suan Hui Pu 1,3 and Neil M. White 2 1 MechatronicsResearchGroup,UniversityofSouthampton,SouthamptonSO171BJ,UK; suanhui.pu@soton.ac.uk 2 Smart Electronic Materials and Systems Research Group, University of Southampton, Southampton SO17 1BJ, UK; nmw@ecs.soton.ac.uk 3 Mechatronics Research Group, University of Southampton Malaysia Campus, Iskander Puteri 79200, Johor, Malaysia * Correspondence: utj1n15@soton.ac.uk; Tel.: +44-792-624-1394 † PresentedattheEurosensors2018Conference,Graz,Austria,9–12September2018. Published: 21 December 2018 Abstract: The effect of water wave impacts and breakdown on the output performance of Water- Dielectric Single Electrode Mode Triboelectric Nanogenerators (WDSE-TENG) has been evaluated. When water contacts a TENG consisting of a hydrophobic dielectric layer, the triboelectric effect is generated with a net negative charge on the dielectric material and net positive charge on the water surface. The hydrophobic dielectric materials, which show the highest electrical output performance in contact with water, were FEP, silicone rubber and polyimide. The average output power of each sample for a load resistance of 10 MΩ was found to be in the range 14.69 to 19.12 μW. The results demonstrate that WDSE-TENG devices can work as an alternative energy harvesting mechanism by using water as a triboelectric material. Keywords: water-dielectric; triboelectricity; energy harvesting; sensing; self-powering 1. Introduction Ocean wave energy has attracted great interest as a source of electrical energy for many years. Effective utilization and sustainability of this kind of energy can be exploited due to the effects of climate change with the rapid increase of sea levels and more recurrent flooding in coastal zones. Specifically, the cumulative loads of wave impact forces at coastal defence structures deliver high magnitude pulse-like forces with a wide frequency range of destructive oscillatory compressed air bubbles at the structure-water interfaces in the range of 30 to 300 Hz with a pressure range of 50 to 350 Pa predicted through a fluid-structure simulation [1]. Such energy can be potentially harvested and exploited using WDSE-TENG that converts the external mechanical energy into electricity by a combination of triboelectric effect and electrostatic induction, based on contact electrification between water and hydrophobic dielectric polymer films (Polydimethylsiloxane (PDMS), Polytetrafloroethylene (PTFE), silicone rubber, Fluorinated ethylene propylene (FEP) and Polyimide (Kapton)). Traditionally, TENG are designed to work between solid materials in contact and they work well under dry conditions [2]. However, triboelectricity can exist when liquids are flowing through insulating tubes [3,4]. Therefore, in order to explore the opportunity to use water as one type of triboelectric material choice for TENG, a single electrode and split single electrode TENG prototypes were fabricated and characterized to study and analyze the contact electrification between water and Proceedings 2018, 2, 714; doi:10.3390/proceedings2130714 www.mdpi.com/journal/proceedings

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