An eco-friendly BaTiO3/gelatin composite for flexible and reusable piezoelectric nanogenerators

The degradability and recycling of piezoelectric devices are of great practical importance. In this letter, we present a novel reusable device consisting of piezoelectric BaTiO 3 nanoparticles embedded in a degradable gelatin matrix. The device exhibits exceptional flexibility, a high output voltage of 3 V, and a maximum power density of 0.06 μW/cm 2 . Furthermore, the reconstruction experiment demonstrates the device’s remarkable stability and reliability, as evidenced by its minimal output voltage attenuation.