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Open AccessArticle

Wearable Device Oriented Flexible and Stretchable Energy Harvester Based on Embedded Liquid-Metal Electrodes and FEP Electret Film

by Jianbing Xie 1,*, Yiwei Wang 1, Rong Dong 2 and Kai Tao 1,*
1
Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi’an 710072, China
2
School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(2), 458; https://doi.org/10.3390/s20020458
Received: 13 November 2019 / Revised: 10 January 2020 / Accepted: 10 January 2020 / Published: 14 January 2020
(This article belongs to the Collection Wearable and Unobtrusive Monitoring Systems)
In this paper, a flexible and stretchable energy harvester based on liquid-metal and fluorinated ethylene propylene (FEP) electret films is proposed and implemented for the application of wearable devices. A gallium liquid-metal alloy with a melting point of 25.0 °C is used to form the stretchable electrode; therefore, the inducted energy harvester will have excellent flexibility and stretchability. The solid-state electrode is wrapped in a dragon-skin silicone rubber shell and then bonded with FEP electret film and conductive film to form a flexible and stretchable energy harvester. Then, the open-circuit voltage of the designed energy harvester is tested and analyzed. Finally, the fabricated energy harvester is mounted on the elbow of a human body to harvest the energy produced by the bending of the elbow. The experimental results show that the flexible and stretchable energy harvester can adapt well to elbow bending and convert elbow motion into electric energy to light the LED in a wearable watch. View Full-Text
Keywords: flexible and stretchable electronics; energy harvester; liquid-metal; wearable device; electret flexible and stretchable electronics; energy harvester; liquid-metal; wearable device; electret
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Xie, J.; Wang, Y.; Dong, R.; Tao, K. Wearable Device Oriented Flexible and Stretchable Energy Harvester Based on Embedded Liquid-Metal Electrodes and FEP Electret Film. Sensors 2020, 20, 458.

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