Analysis and experimental validation of the figure of merit for piezoelectric energy harvesters

File Description SizeFormat 
Deutz et al 2018 - FoM piezo energy harvesters - AAM.pdfFile embargoed until 01 March 20191.48 MBAdobe PDF    Request a copy
Title: Analysis and experimental validation of the figure of merit for piezoelectric energy harvesters
Author(s): Deutz, DB
Pascoe, J-A
Schelen, B
Van der Zwaag, S
De Leeuw, DM
Groen, P
Item Type: Journal Article
Abstract: Piezoelectric energy harvesters are at the front of scientific research as enablers of renewable, sustainable energy for autonomous wireless sensor networks. Crucial for this disruptive technology is the achievable output power. Here we show, analytically, that the maximum output energy per unit volume, under a single sinusoidal excitation, is equal to 1/(4 − 2k2) × 1/2dgX2, where k2 is the electromechanical coupling coefficient, d and g are the piezoelectric charge and voltage coefficient, respectively, and X is the applied stress. The expression derived is validated by the experimentally measured output energy for a variety of piezoelectric materials over an unprecedented range of more than five orders of magnitude. As the prefactor 1/(4 − 2k2) varies only between 1/2 and 1/4 the figure of merit for piezoelectric materials for energy harvesters is not k2, as commonly accepted for vibrational harvesters, but dg. The figure of merit does not depend on the compliance, or Young's modulus. Hence we argue that commonly used brittle inorganic piezoelectric ceramics can be replaced by soft, mechanically flexible polymers and composite films, comprising inorganic piezoelectric materials embedded in a polymer matrix.
Publication Date: 1-May-2018
Date of Acceptance: 20-Feb-2018
URI: http://hdl.handle.net/10044/1/60608
DOI: https://dx.doi.org/10.1039/c8mh00097b
ISSN: 2051-6355
Publisher: Royal Society of Chemistry
Start Page: 444
End Page: 453
Journal / Book Title: Materials Horizons
Volume: 5
Issue: 3
Copyright Statement: © 2018 The Royal Society of Chemistry.
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Materials Science, Multidisciplinary
Chemistry
Materials Science
VIBRATION
CERAMICS
DEVICES
TRANSDUCERS
GENERATION
EFFICIENCY
DENSITY
STORAGE
MOTION
SOFT
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Materials Science, Multidisciplinary
Chemistry
Materials Science
VIBRATION
CERAMICS
DEVICES
TRANSDUCERS
GENERATION
EFFICIENCY
DENSITY
STORAGE
MOTION
SOFT
Publication Status: Published
Embargo Date: 2019-03-01
Online Publication Date: 2018-03-01
Appears in Collections:Faculty of Engineering
Aeronautics



Items in Spiral are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commons