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A core–shell coaxially structured triboelectric nanogenerator (CSTN) is fabricated by inserting the inner hollow circular tube into the outer hollow circular tube, which can be used for energy harvesting and motion sensing.

This paper presents a magnetically levitated-triboelectric nanogenerator to harvest mechanical energy and detect acceleration of the vibatrion in the surroundings. Based on the effective conjunction of triboelectrification and electromagnetic induction, maximum power density of 3.23 W m-3 is obtained at 100 MΩ 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 KΩ 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 μF 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.