Electrospun Aluminum Nitride‐Poly(vinylidenefluoride‐hexafluoropropylene)/Hexagonal Boron Nitride Nanocomposite Fibers for High‐Performance Piezoelectric Nanogenerators

The growing depletion of conventional energy sources has intensified the search for sustainable alternatives such as piezoelectric nanogenerators (PENGs) capable of harvesting mechanical energy from the environment. In this study, flexible PENGs were fabricated using electrospun poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) nanofibers incorporated with aluminum nitride (AlN) and hexagonal boron nitride (hBN) fillers. The influence of filler composition ranging from 0 to 10 wt% hBN on morphology, phase formation, and output performance was systematically investigated. Structural and surface characterizations were conducted using Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy‐dispersive X‐ray spectrometry (EDS). The optimized PVDF‐HFP/AlN nanocomposite exhibited an output voltage of 2.647 V and a current of 0.49 μA, while the incorporation of hBN further enhanced the piezoelectric response to 4.2 V and 0.82 μA, corresponding to approximately 59% improvement. The device achieved a maximum power density of 21.5 mW/m 2 at a 20 MΩ load, demonstrating superior energy conversion efficiency. These results point out the importance of electrospun PVDF‐HFP/AlN–hBN nanocomposites as promising materials for flexible, self‐powered electronic and wearable sensor applications.