Toward Droplet Energy Harvesting in Harsh Environment: Mechanical Buckling‐Induced 3D Structured Droplet‐Based Electricity Multigenerator

Abstract Opening new horizons for droplet‐based energy harvesters, droplet‐based electricity generators (DEGs) face several obstacles, such as deficient current output and vulnerability to the external environment. In this study, a droplet‐based electricity multigenerator (DEMG) subserved by an electromagnetic generator (EMG) is proposed to tackle them. By introducing a mechanical buckling‐induced 3D structure, the DEMG is designed to have a sufficiently high figure of merit for flexibility/elasticity to harvest electric energy from droplets. Thanks to the hybrid effect of EMG, the total amount of induced charge from DEMG is enhanced by more than 8809% compared with that from DEG only. Furthermore, a continuous energy supply is expected from DEMG even under dusty and humid conditions. This study not only provides a pathway to overcome the inherent limitations of conventional DEGs but also paves the way for efficient droplet energy harvesting technologies applicable in diverse environmental conditions.