Energy harvesting using hybridization of dielectric nanocomposites and electrets
Résumé
Electrostrictive polymers have been investigated as electroactive materials for electromechanical energy harvesting. This kind of material is isotope, i.e. there is no permanent polarization compared with piezoelectric material, so in order to ensure its polarization and scavenging energy, the electrostrictive polymers need necessarily an application of a static field. To avoid this problem, we used the hybridization of electrostrictive polymer with electret. The present work aims an analytical modeling for predicting the power convert when the material was mechanically excited. The study was carried out on polyurethane and terpolymer [P(VDF-TrFE-CFE)] films, either without filler or filled with carbon nanopowder. Experimental measurements of the harvested power showed a good agreement with the theoretical behavior predicted by the proposed model. It was also shown that the incorporation of nanofillers increased the power harvested from 5.22·10-2 to 1.498·10-1μWcm-3 and from 6.87·10-1 to 1.76μWcm-3 in polyurethane and in the terpolymer, respectively. © 2015 John Wiley & Sons, Ltd.
Mots clés
Electrostrictive polymers
Measurements of
Electromechanical energy
Scavenging energy
Static fields
Carbon
Carbon films
Conducting polymers
Electrets
Energy harvesting
Fillers
Isotopes
Nanostructured materials
Polarization
Polyurethanes
Carbon nanopowders
Electro-active polymers
Electroactive material
Polymers