Resilient electret film-based vibrational energy harvesters with a V-shaped counter electrode

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Xiaoya Yang, Xingchen Ma, Chuan Ding, Gerhard M. Sessler, Heinz von Seggern, Mario Kupnik, Ying Dai, Pengfei He, Xiaoqing Zhang
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Abstract

Vibrational energy harvesters, which can convert mechanical energy distributed widely in the surrounding environment to electrical energy in a convenient, eco-friendly and sustainable way, have attracted great attention in both academia and industry. In this study, a resilient electret film-based vibrational energy harvester with a V-shaped counter electrode is introduced, simulated and constructed. A negatively charged fluorinated polyethylene propylene (FEP) electret film with a wavy shape was adopted in the devices, achieving simultaneously a stable embedded biased voltage and a large tensile deformation during vibration. The influences of the factors on the performance of the device, including the initial stretching state of the resilient electret film, seismic mass and depth of the V-shape counter electrode, were analyzed comprehensively with finite element simulation and compared to experiments. Further, the structure of the device was optimised for generating a high output power, and a good agreement between the simulation and experimental data was achieved. Additionally, the resonant frequency of the device can be easily tuned between 28 and 68 Hz by merely adjusting the initial stretching state of the wavy FEP electret film, guaranteeing great superiority for broad bandwidth energy harvesting applications. For an optimised energy harvester with a volume of only 15 × 5 × 1.7 mm3 and a tiny seismic mass of 25 mg, and a normalized output power referring to 1 × g (g is the gravity of the Earth) up to 547 μW was obtained at its resonant frequency of 28 Hz. These results demonstrate that such a miniaturised vibrational energy harvester is a promising electrical energy supplier for low-power-consumption electronic devices, in particular in wireless sensor networks.

Abstract Image

具有V形反电极的弹性驻极体膜振动能量收集器
振动能量采集器将广泛分布在周围环境中的机械能以一种方便、环保、可持续的方式转化为电能,引起了学术界和工业界的广泛关注。本文介绍了一种基于弹性驻极体膜的v型反电极振动能量收集器,并对其进行了仿真和构造。器件采用带负电荷的波浪状氟化聚乙烯(FEP)驻极体膜,在振动过程中具有稳定的嵌入偏置电压和较大的拉伸变形。通过有限元模拟和实验对比,综合分析了弹性驻极体膜的初始拉伸状态、v形对电极的地震质量和深度等因素对器件性能的影响。进一步对器件结构进行了优化,使其能产生较高的输出功率,仿真结果与实验数据吻合较好。此外,只需调整波状FEP驻极体膜的初始拉伸状态,该器件的谐振频率就可以轻松地在28至68 Hz之间进行调谐,从而保证了宽带能量收集应用的巨大优势。优化后的能量采集器体积仅为15 × 5 × 1.7 mm3,地震质量仅为25 mg,在28 Hz的谐振频率下,其归一化输出功率为1 × g (g为地球重力),最高可达547 μW。这些结果表明,这种小型化的振动能量采集器是一种很有前途的低功耗电子设备的电能供应商,特别是在无线传感器网络中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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