Resonant Cavity‐Coupled Triboelectric Acoustic Energy Harvester Based on PVDF/GO Composite Nanofibers

The growing proliferation of Internet of Things (IoT) devices has intensified the need for efficient, self‐powered solutions, particularly in low‐energy environments. To overcome the limitations of conventional acoustic energy harvesters in the low‐frequency range, we propose an acoustic energy harvesting device that combines a quarter‐wavelength resonator (QWR) with a polyvinylidene fluoride/graphene oxide (PVDF/GO)‐based triboelectric nanogenerator (TENG). Electrospun PVDF/GO nanofiber films with varying GO concentrations were fabricated and characterized. Structural analyses revealed that 0.08 wt% GO maximizes β‐phase content, significantly enhancing dielectric properties and acoustic charge conversion efficiency. At 117 dB and 130 Hz, the standalone TENG produced 295 V and 62 µA, whereas integration with the QWR boosted output to 602 V and 177 µA, with a peak power of 25.76 mW (power density: 677 µW/cm 2 ), reflecting 104% and 185% improvements in voltage and current, respectively. This synergistic QWR‐TENG system demonstrates superior low‐frequency energy harvesting capabilities, making it a strong candidate for self‐powered sensors and environmental monitoring.