Journal
NANO ENERGY
Volume 53, Issue -, Pages 213-224Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.08.034
Keywords
Fully-enclosed; Hybrid nanogenerator; Wrist-wearable energy harvester; Self-powered sensor; Biomechanical energy
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Funding
- Bio AMP
- Medical Technology Development Program of the National Research Foundation of Korea (NRF) - Korean government, MSIP
- Technology Innovation Program - Ministry of Trade, Industry AMP
- Energy (MI, Korea) [10065696]
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Human body motion is highly regarded as a promising source of energy for powering body-worn electronic devices and health monitoring sensors. Transforming the human biomechanical energy into an electrical energy provides a sustainable energy to drive those devices and sensors, reducing their battery dependency. This work presents a fully-enclosed wrist-wearable hybridized electromagnetic-triboelectric nanogenerator (FEHN) for effectively scavenging energy from the low-frequency natural human wrist-motion (<= 5 Hz). The FEHN incorporates the rolling electrostatic induction and electromagnetic induction using a freely moving magnetic ball inside a hollow circular tube. The materials used in 3D printing technology are used as energy harvesting material for easy, quick and worthwhile fabrication of the FEHN. A thin flexible flux concentrating material is introduced to increase the emf and enhances the electromagnetic output performance. The FEHN can harvest energy under the diverse circumstances and irregular wrist-motions, such as swinging, waving, shaking, etc. Following the experiments, the FEHN achieves an average power density of 0.118 mW cm(-3) and can drive a commercial wrist-watch continuously for more than 23 min from just 5 s of wrist motion. This successful demonstration renders an effective approach for scavenging wasted biomechanical energy and provides a promising solution towards the development of sustainable power supply for wearable electronic devices and self-powered healthcare monitoring sensors.
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