A Nanogenerator Enabled by a Perfect Combination and Synergetic Utilization of Triboelectrification, Charge Excitation and Electromagnetic Induction to Reach Efficient Energy Conversion

Triboelectric-electromagnetic hybridized nanogenerator (TEHG) is confirmed as an effective energy harvesting for Internet of Things. However, it is still a great challenge to gain a high-output triboelectric-nanogenerator (TENG) and to perfectly combine TENG with electromagnetic generator (EMG). Herein, a TEHG composed of space confined multi-layer-stack TENG (SM-TENG) and stack compression promoted flux change EMG is proposed. The interaction of magnets on the rotor with the magnets on the stator makes contact-separation of the SM-TENG and changes the magnetic flux of EMG in rotation process, reducing wear and deformation of TENG. A voltage multiplier circuit (VMC) with a Zener diode is employed to enhance SM-TENG performance and maintain stable output. The output charge and current of four SM-TENG units reach 3.2 mu C and 385 mu A at rotatory speed 60 rpm, and the voltage of four EMG reaches 8.09 V. The perfect combination and synergetic utilization of triboelectrification, charge excitation, and electromagnetic induction in a single device are realized. The integrated TEHG can power 12 bulbs (2 W) and 16 thermo-hygrometers, and a Bluetooth thermo-hygrometer to transmit wireless signals to a mobile phone. This work provides a new strategy for high efficient integration and utilization various mechanisms in one energy-harvesting device.