Mechanical and Acoustic‐Driven BiFeO₃ Composite Films‐Based Hybrid Nanogenerator for Energy Harvesting and Sensing Applications

Abstract

Nanogenerators for acoustic energy harvesting are still in the early stage of development, and many challenges such as the optimization of device structure and the design of efficient and sensitive materials need to be addressed. To solve the above‐mentioned problems, herein, advancement in synthesized multiferroic material for hybridizing the nanogenerator and efficient harvesting of various energies such as acoustic, mechanical, and vibrational energies is reported. Initially, bismuth ferrate (BiFeO3, BFO)‐based composite films are prepared with high ferroelectric and dielectric coefficients. The hybrid nanogenerator (HNG) based on a 3D‐printed structure has the highest electrical output which is further improved depending on the BFO loading concentration in the composite film. The 0.5 wt% BFO‐loaded PVDF‐based HNG offers the enhanced open circuit voltage, short circuit current, and charge density values of ≈30 V, ≈1 µA, and ≈10 µC/m2, respectively. The optimized HNG is employed to harvest mechanical energy from everyday human life. Furthermore, the HNG layers are used in the fabrication of a multi‐energy harvester/sensor (MEH/S) which can harvest/sense various vibrational and acoustic energies under different acoustic frequencies and amplitudes, respectively. The harvested energy from the MEH/S is tested to power portable electronics.

Piezoelectric and Triboelectric Contributions by Aromatic Hyperbranched Polyesters of Second-Generation/PVDF Nanofiber-Based Nanogenerators for Energy Harvesting and Wearable Electronics

“…In this context, TENGs effectively scavenge high-entropy mechanical energy and generate electricity based on the coupling of triboelectrification and electrostatic induction effects. − In this case, electric charges are generated by friction (sliding motion, contact separation, etc. ), which paves the way for an extensive range of conveniently integrated materials for harvesting energy. , TENG devices possess many advantages, including easy fabrication process, simple device architecture, high output power, cost-effectiveness, safety, etc. , However, the development of stable and highly efficient TENGs and their practical feasibility remain challenging.…”