High-performance hybrid generator based on low frequency stochastic resonance

This paper reports a new hybrid energy harvesting approach which combines triboelectricity and piezoelectricity based on low-frequency (less than 5 Hz, such as environmental vibrations) stochastic resonance. A vibration configuration was well designed to enhance the conversion efficiency of mechanical energy to electricity via the stochastic vibration mechanism. Furthermore, the electric output performance of the proposed generator is significantly strengthened by adding triboelectric effects to bi-stable structured energy harvester. Power density of the piezoelectric part and triboelectric part are 1.85mW/cm3 and 1.81mW/cm3, respectively, showing attractive potential for generating high output by harvesting low-frequency vibration from the environment over a broad frequency band.