0.8BNT-0.2BKT ferroelectric-based multimode energy harvester for self-powered body motion sensors

is required to achieve superior applications from piezoelectric nanogenerators (PENG). The synthesized 1-x(Bi0.5Na0.5TiO3)-x(Bi0.5K0.5TiO3) (BNKT) structural analysis revealed the formation of a morphotropic phase boundary (MPB) at x = 0.2. The MPB 0.8BNT-0.2BKT system exhibited a dielectric constant of 1338 at 1 kHz, a remanent polarization (P-r) of 37.14 mu C/cm(2) with a coercive field (E-c) of 28.8 kV/cm at 1 Hz, and a piezoelectric coefficient (d(33)) of 110 pC/N. Composite films based on BNKT82 were then used to prepare stretchable, planar, and compressive PENGs. The stretchable PENG (SPENG) generated 8.1 V and 80 nA. The planar PENG (PPENG) in bending mode yielded 12.5 V and 110 nA, while the same device in compressive mode delivered 22.5 V and 210 nA with a power density of 13.81 mW/m(2) at 90 M Omega. The PENGs analyzed under poled, unpoled, displacement, and acceleration effects systematically; also inspected stability, capacitor charging tests. The PENGs are demonstrated as self-powered human body sensors under the multimode of forces generated by the human body's movement.

Automated summary

Superior applications from piezoelectric nanogenerators (PENG) require advanced materials like the synthesized BNKT, which have been used to create stretchable, planar, and compressive PENGs with different performance characteristics. These PENGs have been demonstrated as self-powered human body sensors capable of generating electricity from various forces.