基于摩擦和压电复合机制的接触-分离式纳米发电机

A Contact-Separation Type Nanogenerator Based on Triboelectric and Piezoelectric Hybrid Mechanism

介绍了一种基于摩擦和压电复合机制的接触-分离式纳米发电机的制备方法,利用倒模工艺形成带有铜网微结构的硅胶膜,与铝电极形成顶端摩擦层结构;利用聚偏氟乙烯(PVDF)膜和铝电极形成底端压电层结构,其中中间铝电极为共享电极,使摩擦单元和压电单元协同工作。研究结果表明,摩擦单元和压电单元在接触-分离的周期过程中产生的电信号不同步,需要分别对它们进行整流后混合输出。摩擦单元整流后的电压峰值约为100 V,压电单元整流后的电压峰值约为50 V,整流后混合输出的电能能够点亮50盏LED灯,存储在电容中能够为电子表正常工作持续供电,因此,复合纳米发电机可以作为振动能量采集器被广泛应用。

A fabrication method of a contact-separation type nanogenerator based on triboelectric and piezoelectric hybrid mechanism was proposed. The top triboelectric layer was fabricated using aluminum electrodes and silicone rubber film with copper net micro-structure formed by the reverse mould technology. The bottom piezoelectric layer was fabricated using polyvinylidene fluoride （PVDF） film and aluminum electrodes, and the middle aluminum electrode was the shared electrode to realize the cooperative work between the triboelectric unit and piezoelectric unit. The study results show that the electrical signals produced by the triboelectric unit and pie- zoelectric unit in the periodic process of contact-separation are not synchronized, so they need to be rectified and mixed to output respectively. The rectified voltage peak value of the triboelectric unit is about 100 V, the rectified voltage peak value of the piezoelectric unit is about 50 V. The mixed rectified output electrical energy can light up 50 LED lights, and can be stored in the ca- pacitors to provide continuous power for normal working of the electronic meter. Therefore, the hybrid nanogenerator can be widely used as a vibration energy harvester.