Bimorph hybrid fluid diaphragm device for vibration energy harvesting

A low resonant frequency piezoelectric energy harvesting using a hybrid fluid diaphragm (HFD) is presented. This paper describes the design, fabrication and characterization of such a device for harvesting energy from vibrations. The PHFD consists in an incompressible fluid confined between two thin piezoelectric membranes. The output voltage and power of the P(VDF-TrFE) HFD are studied based on experimental and simulation results. This device resonates at 164 Hz for low acceleration (10 m/s
²
). The simulations showed the power production of about 6 μW with a power density of 78.98 μW/cm
³
of electroactive material volume.