Considerable research has been devoted to generating electricity from airborne noise. However, it is still a challenge to develop high-efficiency, large-output energy harvesters for this purpose. Herein, we present a novel approach to improve the electrical output of a noise-related energy harvester, made of single-layer polyvinylidene difluoride (PVDF) nanofiber membrane, simply by incorporating a small number of nylon-6 nanofibers into the PVDF fibrous matrix. The addition of just 4.3 wt% nylon-6 nanofibers profoundly improves the acoustoelectric conversion. In an airborne noise environment (e.g., 230 Hz 118 dB SPL), the device (working area 12 cm²) can generate peak electrical outputs as high as 201.4 V and 17.6 µA (power density 1.30 W/m²). The voltage and current outputs are 2.7 times and 2.6 times higher, respectively, compared to the pure PVDF nanofiber counterpart. The nylon-6/PVDF device also showed broader bandwidth, covering a frequency range of 230–800 Hz. The nylon-6 nanofibers were found to play dual roles in noise harvesting: 1) a tribo component to cause an endogenous triboelectric effect with PVDF nanofibers, and 2) a dopant to form macro dipoles, thus improving the charge transport from a dielectric layer to the external electrodes, which significantly increases the electrical outputs. Incorporating high polarity dopant may form a novel approach to improve the electrical outputs of acoustoelectric nanofibers.

大量研究致力于利用空气噪声发电。然而，为此目的开发高效、大输出的能量收集器仍然是一个挑战。在此，我们提出了一种提高噪声相关能量收集器电输出的新方法，该方法由单层聚偏二氟乙烯 (PVDF) 纳米纤维膜制成，只需将少量尼龙 6 纳米纤维加入 PVDF 纤维基质中即可。仅添加 4.3 wt% 的尼龙 6 纳米纤维就极大地改善了声电转换。在空气噪声环境（例如，230 Hz 118 dB SPL）中，设备（工作区域 12 cm ²）可以产生高达 201.4 V 和 17.6 µA（功率密度 1.30 W/m ²）。与纯 PVDF 纳米纤维对应物相比，电压和电流输出分别高出 2.7 倍和 2.6 倍。尼龙 6/PVDF 设备还显示出更宽的带宽，覆盖了 230-800 Hz 的频率范围。发现尼龙 6 纳米纤维在噪声收集中发挥双重作用：1) 摩擦组件与 PVDF 纳米纤维产生内源摩擦电效应，2) 掺杂剂形成宏观偶极子，从而改善电荷从介电层传输到外部电极，这显着增加了电输出。加入高极性掺杂剂可以形成一种新的方法来改善声电纳米纤维的电输出。