An Electromagnetic-Piezoelectric-Triboelectric Hybridized Energy Harvester Towards Blue Energy

This paper proposed a hybridized energy harvester combining electromagnetic, piezoelectric, and triboelectric transduction mechanisms for ocean wave energy harvesting. Two energy harvesting mechanisms of wave shaking and heaving are contained in this device. The shaking energy harvesting mechanism (S-EHM) consists of a compound pendulum mechanism and a gear mechanism. Together with an electromagnetic generator (EMG) and a piezoelectric generator (PEG) are used to harvest the shaking energy of ocean waves. The heaving energy harvesting mechanism (H-EHM) consists of a sliding sub, mass slider and springs. Meanwhile, the triboelectric nanogenerator (TENG) is used to harvest the undulations energy of ocean waves. They all supply energy to the electrical appliances inside the marine buoy, which can extend its working life. The diameter of the harvester is 140 mm and the height is 185 mm. The tested maximum output voltages of the electromagnetic, piezoelectric and triboelectric parts are 12V, 18V, and 55 V, respectively. Moreover, the device can light up at least 90 LEDs and can power the temperature and humidity sensor to display the ambient temperature.