Yu Zhaohan, Chen Ming, Wang Yunming, Zheng Jiaqi, Zhang Yongkang, Zhou Huamin, Li Dequn
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen, 333403, P. R. China.
ACS Appl Mater Interfaces. 2021 Jun 16;13(23):26981-26988. doi: 10.1021/acsami.1c04489. Epub 2021 Jun 7.
Restricted by the inherent property of low power density, acoustic energy can hardly be effectively captured by conventional piezo- or triboelectric nanogenerators for powering miniature electronics. Herein, a novel piezo-tribo hybrid nanogenerator employing nanoporous polyvinylidene fluoride (PVDF) hollow fiber and polydimethylsiloxane (PDMS) valve, which can mimic the eardrum, has been advocated for efficient acoustic harvesting. The nanoporous, hollow, and valve structure design, together with the effective combination of piezo- and triboelectricity, make the nanoporous PVDF hollow fiber and PDMS valve based acoustic harvester (PHVAH) a promising candidate for acoustic-electric conversion. With an optimal output of 105.5 V and 16.7 μA and a power density of 0.92 W m under the sound stimulation of 117.6 dB and 150 Hz, it can not only recognize audio signals but also convert the sound into electrical energy to light up seven LED bulbs in series. Exhibiting excellent durability and stability, the disruptive innovation proposed here is an effective method for hunting the ubiquitous sound energy in the environment, which provides great potential and impetus for using acoustic-electric conversion to power various low-power-consumption sensors.
受低功率密度固有特性的限制，传统的压电或摩擦电纳米发电机很难有效地捕获声能来为微型电子设备供电。在此，一种新型的采用纳米多孔聚偏二氟乙烯（PVDF）中空纤维和聚二甲基硅氧烷（PDMS）瓣膜的压-摩混合纳米发电机被提出用于高效的声能收集，该发电机能够模拟耳膜。纳米多孔、中空和瓣膜结构设计，以及压电和摩擦电的有效结合，使得基于纳米多孔PVDF中空纤维和PDMS瓣膜的声能收集器（PHVAH）成为声电转换的一个有潜力的候选者。在117.6 dB和150 Hz的声音刺激下，其最佳输出为105.5 V和16.7 μA，功率密度为0.92 W/m²，它不仅能够识别音频信号，还能将声音转换为电能来串联点亮七个发光二极管灯泡。这里提出的颠覆性创新展示出优异的耐久性和稳定性，是一种捕获环境中无处不在的声能的有效方法，为利用声电转换为各种低功耗传感器供电提供了巨大潜力和动力。
