Energy harvesting from vibration using flexible floroethylenepropylene piezoelectret films with cross-tunnel structure

Abstract

Flexible fluoroethylenepropylene (FEP) piezoelectret films with a cross-tunnel structure were prepared using a template-based process and contact charging. Energy harvesting from the fabricated FEP films was investigated at various exciting frequencies and load resistances. The results show that the quasi-static piezoelectric d 33 coefficients for the FEP piezoelectret samples are of the order of 1000 pCN -1 at an applied pressure of 3.1 kPa. The output voltage increases with the increase in load resistance, and the output power is dependent on the load resistance and vibration frequency. At a load resistance of 0.9 MΩ and vibration frequency of 650 Hz, the output power of 3.5 μWg -2 was obtained for the sample with an area of 3.14 cm 2 and a seismic mass of 44.1 g. Such thin, light and flexible FEP piezoelectret films may be applied in wearable environmental energy harvesting system.

Energy harvesting from vibration with cross-linked polypropylene piezoelectrets

“…[7][8][9][10][11][12][13][14] Piezoelectrets are charged polymer foams exhibiting strong piezoelectric effects, small bulk density, flexibility or/and stretchability. 15,16 The quasistatic piezoelectric d 33 coefficients of piezoelectrets can be up to a few hundred pC/N in polypropylene (PP) films [17][18][19][20][21][22][23] and are of similar size or larger in some fluorocarbon polymer films, /ε 0 ε r (see also Sect.…”

“…Relevant studies show that energy harvesters based on normal cellular PP piezoelectrets or piezoelectrets made of layered fluoroethylenepropylene (FEP), excited in the {3-3} and stretching modes, can generate an output power of up to about 10 µW, referred to the acceleration g (in italics) due to gravity. [7][8][9]12 Our prior studies indicate that, compared with normal cellular PP, electron irradiated polypropylene (IXPP) not only results in piezoelectrets with improved thermal stability of d 33 and better mechanical properties, 28 but also yields enhanced stretchability after proper modifications of the microstructure. 21 Therefore, it is of interest to explore the capability of energy harvesting from vibration by using IXPP piezoelectret films.…”

Energy scavenging from vibration with two-layer laminated fluoroethylenepropylene piezoelectret films

“…In the step of Fig. 1 Schematic and SEM image of two-layer laminated FEP film with crosstunnel structure [8,10] .…”

“…1(b). Thereafter, the FEP films are piezoelectric and thus called piezoelectrets [10] . The quasi-static d 33 coefficients of the FEP piezoelectret films were determined by measuring the charges induced upon applying a mechanical force to the sample surface.…”

Multilayer piezoelectret foam stack for vibration energy harvesting

“…Studies have also investigated the use of piezoelectret foam in harvesting energy from the human body during walking (Luo et al, 2015) and from arterial forces and throat motion (Wu et al, 2015). While polypropylene is the most common piezoelectret material studied (Wegener and Bauer, 2005), Wang et al (2015) and Zhang et al (2014Zhang et al ( , 2015 have investigated a new class of piezoelectret material, cross-tunnel fluoroethylenepropylene (FEP), for energy harvesting and showed improved thermal stability compared to polypropylene.…”