Bioinspired PVDF Piezoelectric Generator for Harvesting Multi‐Frequency Sound Energy

Abstract With the rapid development of micro‐energy harvesting technology, noise has great potential as a new type source by developing high‐performance acoustic energy harvester (AEH). Nevertheless, challenges from are low density, multi‐frequency mixed sound, and unstable sound pressure. Piezoelectric‐based AEHs proposed solution, but most reported devices need to work at certain frequency very high pressure, exhibit disadvantages being bulky heavy when using an extra sound‐pressure amplifier. Here, eardrum cochlea bioinspired polyvinylidene fluoride (PVDF) piezoelectric generator which is lightweight, compact, simple structure low‐cost, harvests energy. Although commercial pure PVDF membrane, prepared AEH still presents acoustoelectric conversion performance with output power 8.45 µW sensitivity 1 V Pa −1 200 Hz 100 dB without any amplifier through optimizing structure–vibration–frequency relationship. More importantly, do not only ability function also have abilities recognition sensing, show in application self‐powered sensors.