Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5008205 | Sensors and Actuators A: Physical | 2017 | 21 Pages |
Abstract
Unlike the nano-generators whose piezoelectric materials in forms of particles, fibers and thin film, we present a sandwich structure flexible energy harvester using a high performance bulk form PIMNT/epoxy 2-2 composite flake (epoxy volume ratio of 20%). The device consists of a polyethylene terephthalate (PET) substrate, a PIN-PMN-PT single crystal/epoxy 2-2 composite flake (a thickness of 50 mm), an interdigital electrodes (IDEs) film and a PET cover, which is flexible enough to harvest energy from large deformation biomechanical movements. A theoretical analysis shows that the sandwich structure with composite in the middle layer contributes to the flexibility of the device and high performance bulk PIN-PMN-PT results in its high electrical output. Electrical properties of the device under different strains (bending radius), strain rates, electrode gaps and load resistances are studied systematically. Experimental results show that the device can withstand a small bending radius of 2.2âcm, where an open-circuit of 54.2âV and extrapolation current of 6.7âμA were acquired across a device area of 480âmm2. The instantaneous power reach as high as 105âμW and can maintain its performance after 40000 bending-unbending cycles. We have also used the device to harvest the mechanical energy from motions of human knees and light up 12 red LEDs successfully. High flexibility and excellent electrical output demonstrate the promise of the device in biomechanical motions energy harvesting for self-powered wireless and portable low-power electronics.
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Authors
Zhou Zeng, Linlin Gai, Arnaud Petitpas, Yue Li, Haosu Luo, Dong Wang, Xiangyong Zhao,