A Triboelectric-Electromagnetic Hybrid Nanogenerator Working in Rolling Friction Mode for Self-powered Environmental Monitoring System

Harvesting rotational energy from the environment and efficiently converting it into available electrical energy to power wire sensors nudes is gaining popularity, particularly in the context of the Internet of Things (IoT). However, as a promising solution for energy harvesting, the majority of triboelectric nanogenerators (TENGs) working in sliding friction mode generate much thermal energy and low output current has been a limitation of them to be popularized. Here, a triboelectric-electromagnetic hybrid nanogenerator working in rolling friction mode has been proposed. The infrared temperature measurement photo of the electrode surface temperature after 20,000 contact-separation cycles shows that the TENG working in rolling friction mode generates less thermal energy than that working in sliding friction mode. The maximum output power of electromagnetic generator (EMG) can attain 33.28 mW at a rotation speed of 500 r/min, while the TENG has a maximum output power of 129 $\mu {\mathrm{W}}$. Furthermore, a self-powered environmental temperature monitoring system has been realized. This study demonstrates that there is a new way to detect ambient temperature for low-power consumption scenes.