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Energy harvesting technique has been identified as an innovative and environment-friendly way for powering micro sensors and electronic devices. In this paper, a hybrid generator based on triboelectric and electromagnetic mechanisms (TMHG), which provides two electrical power outputs at the same time, was proposed. The output performance in time and frequency domains are investigated at different initial gap distances and excitation accelerations. At an acceleration of 1 g and an initial gap distance of 5 mm, the maximum power outputs of electromagnetic and triboelectric parts can be obtained as 0.28 mW and 1.09 mW, respectively. The resonant frequency of the TMHG is as low as 23.5 Hz, making it more suitable to harvest energy from low frequency vibrations of less than 30 Hz. Besides, the operating bandwidth of TMHG can be adjusted by changing the initial gap distance according to the application requirements.

We proposed a hybrid piezoelectric and triboelectric-based wind energy harvester with high output performance. A square-shaped flapping blade and two spindle-shaped outer frames are specifically designed to enhance the vortex shedding effect. As wind flows across the device, both the piezoelectric and triboelectric parts produce power outputs at the same time. The cut-in wind speed of the device is as low as 4 m/s and the voltage outputs get improved with the increase in wind speed. As wind speed reaches 14 m/s, the open circuit peak voltage outputs of the piezoelectric, and the upper triboelectric parts are 19.8 and 17.4 V, respectively. The maximum power outputs of these two parts can be obtained as 112 and $76~\mu \text{W}$ at a wind speed of 10 m/s, with optimized load resistances of 0.6 and 0.9 $\text{M}\Omega $ , respectively. [2016-0015]

Wind energy is a kind of inexhaustible renewable clean energy. Wind energy harvesting becomes a potential technique to solve the power supply problem of wireless sensor nodes in field environment. This paper demonstrates a hybrid flapping-leaf microgenerator (FLMG) that convert wind flow energy to electric energy. Both the piezoelectric and triboelectric parts will generate power from wind flow. The output performance can be improved by optimizing the size of the flapping leaf and the connecting position between the cantilever and leaf. At a wind speed of 4.5 m/s, the maximum power of the piezoelectric and triboelectric parts of one-side FLMG can be obtained as 8.1 μW and 13.6 μW at optimized load resistances of 1 MΩ and 0.75 MΩ, respectively.