纳米发生器
摩擦电效应
能量收集
材料科学
光电子学
动能
振动
机械能
功率密度
功率(物理)
电气工程
声学
压电
物理
工程类
复合材料
量子力学
作者
M. Toyabur Rahman,SM Sohel Rana,Md. Salauddin,Pukar Maharjan,Trilochan Bhatta,Hyun-Sik Kim,Hyunok Cho,Jae Yeong Park
出处
期刊:Applied Energy
[Elsevier]
日期:2020-12-01
卷期号:279: 115799-115799
被引量:52
标识
DOI:10.1016/j.apenergy.2020.115799
摘要
Energy harvesting from human motion can be considered a promising and sustainable energy source for powering portable electronics and sensors. Herein, a highly miniaturized freestanding kinetic-impact-based hybridized nanogenerator (MFKI-HNG) is presented to harvest human-induced vibrations effectively. The MFKI-HNG was designed to simultaneously generate hybridized outputs under the same mechanical load through a rational integration of an electromagnetic generator (EMG) and a freestanding-mode triboelectric nanogenerator (TENG). A non-resonant mechanical system with nonlinearity significantly improved the EMG's output performance in the low-frequency vibration range (≤5 Hz). Subsequently, nanowire and micro-nano hierarchical structures developed on tribo-materials further enhanced the output performance of the TENG. After optimizing via theoretical modeling and simulations, the as-fabricated MFKI-HNG was tested using both shaker and human motions. The MFKI-HNG generated maximum output powers of 102.29 mW across the optimum resistances, with a corresponding normalized power density of 3.67 mW cm−3 g−2 at 5 Hz under 10 ms−2 (1 g = 9.8 ms−2). During diverse activities, the MFKI-HNG could harvest a significant amount of energy in different body-worn positions and drive thermo-hygrometers and 380 commercial light-emitting diodes simultaneously. Using a customized power management circuit, the MFKI-HNG can act as a portable power source for modern electronics, such as smartphones and smartwatches. A wireless temperature sensor has successfully run continuously for more than 70 s with the MFKI-HNG from just 6 s of excitations. This study shows the immense potential of harvesting human-induced vibrations via a hybridized nanogenerator for developing a feasible self-powered system for portable/wearable electronics and wireless healthcare monitoring systems.
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