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

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 d33coefficients for the FEP piezoelectret samples are of the order of 1000 pCN-1at 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-2was obtained for the sample with an area of 3.14 cm2and a seismic mass of 44.1 g. Such thin, light and flexible FEP piezoelectret films may be applied in wearable environmental energy harvesting system.