Energy harvester using piezoelectric nanogenerator and electrostatic generator

Abstract

This study demonstrates an energy harvester that combines a piezoelectric nanogenerator and an electret-based electrostatic generator. The device consists of an in-house fabricated nanocomposite (polydimethylsiloxane/barium titanate/carbon nanotube) as a piezoelectric layer and a monocharged Teflon fluorinated ethylene propylene as an electret electrostatic layer. The mechanical impedance of the structure can be altered easily by changing the nanocomposite monomer/cross-linker ratio and optimizing various mechanical energy sources. The energy harvester's performance was characterized by performing measurements with different frequencies (5–20 Hz) under applied dynamic loading. A total volumetric power density of ∼8.8 μW cm−3 and a total stored energy of ∼50.2 μJ min−1 were obtained. These findings indicate that this versatile, lightweight, and low-cost energy harvester can be employed as a power supply source for microelectronics in applications, such as wearables.

High-k dielectric screen-printed inks for mechanical energy harvesting devices

“…and using example voltages of 10 V and 100 V, as used in the experiments. The values shown in Table 2 are above most published data for wearable electrostatic harvesters (0.3-0.6 mW cm À2 ), with a recent publication reporting slightly higher values of 8.8 mW cm À2 for electrostatic harvesters 49 and piezoelectric harvesters (103 mW cm À2 , 6.8 mW cm À3 ) that were demonstrated in this frequency range (0.1 and 5 Hz). 50,51…”

A Bistable Triboelectric Nanogenerator for Low‐Grade Thermal Energy Harvesting and Solar Thermal Energy Conversion

“…[ 24 ] Multiple effects have been successfully demonstrated to preliminarily convert thermal energy into mechanical energy, such as the thermomagnetic effect, [ 17 , 18 ] thermal expansion effect, [ 24 , 25 ] and thermoelastic effect. [ 26 , 27 ] Then, the mechanical energy can be converted into electricity by further coupling with various transducers, mainly including piezoelectric generators, [ 28 , 29 ] electromagnetic generators, [ 30 ] and triboelectric nanogenerators (TENGs). [ 31 , 32 ] Among them, TENGs based on a coupling effect of triboelectrification and electrostatic induction have remarkable advantages of simple structure, [ 33 , 34 ] low cost, [ 35 , 36 ] and excellent output performance at low frequency.…”

A New Hybrid Lead‐Free Metal Halide Piezoelectric for Energy Harvesting and Human Motion Sensing

“…These hybrid materials have the virtues of low elastic moduli and significant piezoelectric properties, which could enable them to show attractive mechanical energy harvesting properties and accurate sensing abilities. Piezoelectric nanogenerators and sensors are two important types of functional electronic devices which have been extensively explored for inorganic perovskite materials, [17,18] such as BaTiO 3 , [19,20] CsPbBr 3 . [21,22] Very recently, the hybrid piezoelectric-based nanogenerators [16,[23][24][25][26] and human body motion sensors [27,28] have been reported and their excellent energy harvesting and sensing performance can be comparable to those of perovskite oxides.…”