Liu Nian, Liu Di, Gao Yikui, Li Shaoxin, Zhou Linglin, Zhao Zhihao, Cui Shengnan, Liu Lu, Wang Zhong Lin, Wang Jie
Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, 530004, P. R. China.
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China.
Small Methods. 2022 May;6(5):e2200066. doi: 10.1002/smtd.202200066. Epub 2022 Mar 29.
As a new technology for high-entropy energy harvesting, a triboelectric nanogenerator (TENG) has broad applications in sensor networks and internet of things as a power source, but its average power density is limited by the fixed low-frequency output. Here, a frequency-multiplication TENG based on intrinsic high frequency of tuning fork is proposed which enables converting low-frequency mechanical energy into high-frequency electric energy. A tuning-fork TENG is used to systematically study the effects of intrinsic frequency, dielectric's thickness, and gap distance on its electric performance, and a total transferred charges of 4.3 µC and an average power density of 9.42 mW m are realized at the triggering frequency of 0.2 Hz, which are 71 times and 5.7 times than that of the single-cycle output of conventional contact-separation TENG, respectively. Moreover, the crest factor also decreases from 3.5 to around 1.5. Then, a homemade tuning fork-like TENG is reasonably designed for harvesting ambient wind energy, achieving an average power density of 20.02 mW m at a wind speed of 7 m s . Specially, its impedance resistance is independent of the mechanical triggering frequency, simplifying the back-end power management circuit design. Therefore, the frequency-multiplication TENG shows a great potential for efficient distributed energy harvesting.
作为一种用于高熵能量收集的新技术，摩擦纳米发电机（TENG）作为电源在传感器网络和物联网中具有广泛应用，但其平均功率密度受到固定低频输出的限制。在此，提出了一种基于音叉固有高频的倍频TENG，它能够将低频机械能转换为高频电能。利用音叉TENG系统地研究了固有频率、电介质厚度和间隙距离对其电性能的影响，在0.2Hz的触发频率下实现了4.3µC的总转移电荷和9.42mW/m²的平均功率密度，分别是传统接触分离TENG单周期输出的71倍和5.7倍。此外，波峰因数也从3.5降至约1.5。然后，合理设计了一种自制的类音叉TENG用于收集环境风能，在风速为7m/s时实现了20.02mW/m²的平均功率密度。特别地，其阻抗与机械触发频率无关，简化了后端电源管理电路设计。因此，倍频TENG在高效分布式能量收集方面显示出巨大潜力。
