Magnetically levitated-triboelectric nanogenerator as a self-powered vibration monitoring sensor

This paper presents a magnetically levitated-triboelectric nanogenerator to harvest mechanical energy and detect acceleration of the vibratrion in the surroundings. Based on the effective conjunction of triboelectrifica-tion and electromagnetic induction, maximum power density of 3.23 W m(-3) is obtained at 100 M Omega and 10 m s(-2) for the triboelectric part, while the electromagnetic part can provide power density of 2.25 W m(-2) at 1 K Omega and 10 m s(-2). The hybridized nanogenerator also exhibits a good stability for the output performance and a good charging performance. This hybridized nanogenerator can light up 40 commercial light-emitting diode bulbs and charge a 470 mu F capacitor by using a power management circuit. Furthermore, due to the magnetically-levitated structure, the hybridized nanogenerator has been utilized as a vibrometer. It can clearly detect the vibration with the acceleration less than 30 m s(-2) and amplitude less than 7.5 mm. This work not only presents a novel approach in the field of mechanical energy harvesting, but also a solid step towards self-powered monitoring technology.