Integrated Triboelectric‐Electromagnetic‐Piezoelectric Self‐Rebounding Energy Harvester for Human Energy Harvesting

Abstract

Abstract A self‐rebounded hybrid energy harvester from human foot motion is investigated. The hybrid energy harvester integrates electromagnetic generators (EMG), piezoelectric nanogenerators (PENG), and triboelectric nanogenerators (TENG) between the two magnetic poles. The harvester uses a pair of mutually exclusive magnetic poles instead of spring‐mass to realize reciprocating motion, which is designed to grow 6 cm, width 5 cm, and height 4 cm. Under low frequency (4 Hz), EMG, PENG, and TENG can deliver a high output power of 6.49 mW, 0.168 µW, and 90.72 µW, respectively. After charging the energy harvesting circuit, the capacitor can continuously output a stable 5 V DC voltage, and the charging performance of the harvester is better than that of a single nanogenerator unit. Besides, the harvester can continuously light up 80 LED lights. After carrying the harvester and jogging for a certain distance, a pedometer module is powered. It shows that the designed self‐rebounding human motion foot energy harvester has certain feasibility in the practical application of wearable devices. The device can be easily assembled under the shoes, demonstrating the great application prospects of the harvester as a sustainable self‐power device for wearable and portable electronics.