Kim Young-Gyun, Hong Seongheon, Hwang Bosun, Ahn Sung-Hoon, Song Ji-Hyeon
Department of Mechanical Engineering, Seoul National University, Gwanak-Ro 1, Gwanak-Gu, Seoul, 08826, Republic of Korea.
MX Division, Samsung Electronics, Samsungro 129, Suwon-Si, Gyeonggi-Do, 16677, Republic of Korea.
Sci Rep. 2022 Nov 9;12(1):19149. doi: 10.1038/s41598-022-23005-2.
With the development of wearable devices and soft electronics, the demand for stretchable piezoelectric energy harvesters (SPEHs) has increased. Energy harvesting can provide energy when large batteries or power sources cannot be employed, and stretchability provides a user-friendly experience. However, the performance of SPEHs remains low, which limits their application. In this study, a wearable SPEH is developed by adopting a kirigami structure on a polyvinylidene fluoride film. The performance of the SPEH is improved by rearranging the stress distribution throughout the film. This is conducted using two approaches: topological depolarization, which eliminates the opposite charge generation by thermal treatment, and optimization of the neutral axis, which maximizes the stress applied at the surface of the piezoelectric film. The SPEH performance is experimentally measured and compared with that of existing SPEHs. Using these two approaches, the stress was rearranged in both the x-y plane and z-direction, and the output voltage increased by 21.57% compared with that of the original film with the same stretching motion. The generated energy harvester was successfully applied to smart transmittance-changing contact lenses.
随着可穿戴设备和柔性电子技术的发展，对可拉伸压电能量采集器（SPEH）的需求不断增加。能量采集能够在无法使用大型电池或电源时提供能量，而可拉伸性则提供了用户友好的体验。然而，SPEH的性能仍然较低，这限制了它们的应用。在本研究中，通过在聚偏二氟乙烯薄膜上采用折纸结构来开发一种可穿戴SPEH。通过重新分布整个薄膜中的应力来提高SPEH的性能。这通过两种方法实现：拓扑去极化，即通过热处理消除相反电荷的产生；以及中性轴优化，即最大化施加在压电薄膜表面的应力。对SPEH的性能进行了实验测量，并与现有SPEH的性能进行了比较。使用这两种方法，在x-y平面和z方向上都重新分布了应力，与具有相同拉伸运动的原始薄膜相比，输出电压提高了21.57%。所生成的能量采集器成功应用于智能透光变色隐形眼镜。
