Matching the Directions of Electric Fields from Triboelectric and Ferroelectric Charges in Nanogenerator Devices for Boosted Performance.

Martins Rutkis,Kaspars Mālnieks,Linards Lapčinskis,Kaspars Pudzs,Martin Timusk,Andris Šutka

doi:10.1016/j.isci.2020.101011

Martins Rutkis, Kaspars Mālnieks + Show 4 more

Open Access

https://doi.org/10.1016/j.isci.2020.101011

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Journal: iScience	Publication Date: Mar 29, 2020
Citations: 21	License type: cc-by

Affiliation: Riga Technical University, University of Tartu

Abstract

SummaryEmbedding additional ferroelectric dipoles in contacting polymer layers is known to enhance the performance of triboelectricnanogenerator (TENG) devices. However, the influence of dipoles formed between the triboelectric surface charges on two contacting ferroelectric films has been ignored in all relevant studies. We demonstrate that proper attention to the alignment of the distinct dipoles present between two contacting surfaces and in composite polymer/BaTiO3 ferroelectric films can lead to up to four times higher energy and power density output compared with cases when dipole arrangement is mismatched. For example, TENG device based on PVAc/BaTiO3 shows energy density increase from 32.4 μJ m−2 to 132.9 μJ m−2 when comparing devices with matched and mismatched dipoles. The presented strategy and understanding of resulting stronger electrostatic induction in the contacting layers enable the development of TENG devices with greatly enhanced properties.

Highlights

IntroductionMany original and creative TENG concepts have been presented in the literature for harvesting mechanical energy and converting it into electricity (Lee et al, 2019)
The field related to triboelectricnanogenerator (TENG) devices is emerging rapidly
The polymer films were spin coated on indium tin oxide (ITO) conductive electrode and contacted against another ITO

Summary

Introduction

Many original and creative TENG concepts have been presented in the literature for harvesting mechanical energy and converting it into electricity (Lee et al, 2019). The triboelectric materials (most commonly polymer insulators) are deposited on two conductive electrodes connected by an external circuit. Upon contacting-separating or sliding, surface charges are formed on the triboelectric materials, which induce an electrostatic charge on the conductive electrodes. Due to electrode oscillation or movement, a potential difference is created, which causes a current flow in the external electric circuit. TENG devices can be integrated into fabrics (Zhou et al, 2014), wearables (Kanik et al, 2015), interior objects (Dhakar et al, 2016), membranes (to harvest energy from sound) (Fan et al, 2015), and even implantable devices (Yao et al, 2018)

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