A Hybridized Triboelectric-Electromagnetic Nanogenerator as a Power Supply of Monitoring Sensors for the Ventilation System

摘要

With the improvement of the airtightness of modern buildings, installing ventilationsystems indoors is becoming increasingly important, which works fora long time continuously and needs to be monitored in real-time. However,the complex wiring of monitoring sensors makes assembly and maintenancemore difficult. This work reports a hybridized triboelectric-electromagneticnanogenerator (HNG) as a power supply of a self-powered wireless monitoringsystem for ventilation systems. The HNG integrates an air inlet cover,a stator with coils and interdigitated copper electrodes, a rotor with magnets,fluorinated ethylene propylene films, and optimized built-in wind blades. TheHNG scavenges wind energy from a ventilation system and serves as a powersupply for electric applications. Under the wind speed of 6.5 m s~(?1) in the ventilationsystem, the maximum stabilized voltage and maximum instantaneouscurrent of the HNG are 177.5 V and 0.049 A, which can charge smartphonesand light up a bulb. Furthermore, the HNG realizes the self-powered wirelesstransmission of temperature and humidity sensing nodes. This work demonstratesan effective wind energy harvester, providing an innovative strategyfor monitoring the condition of the ventilation system and broadening thethoughts of prospective energy harvesting.