Bioinspired 3D‐Printed Microneedle Integrated Trinity System for Synergistic Freshwater‐Electricity Cogeneration

ABSTRACT Atmospheric water around us not only provides a certain number of freshwater resources, but also carries abundant energy. However, existing atmospheric water harvesting devices usually focus on water resources, with less attention to comprehensive utilization of both water and energy involved. Herein, we present a novel trinity harvesting system that embodies the water‐electricity cogeneration concept, integrating biomimetic 3D‐printed microneedles, optimized liquid triboelectric generating film, and electromagnetic modules in a synergistic arrangement. The system achieves simultaneous water and energy harvesting, capitalizing on the dynamic interaction between fog droplets, low‐speed winds, and rotating blades. Such synergistic and efficient utilization of fog water, potential energy contained in falling fog droplets, and low‐speed wind energy makes it deliver a maximum water collection rate of 44.63 kg m − 2 ·h −1 , while outputting a voltage of 222 V. When equipped with a custom‐designed circuit module, it can continuously operate at a mist‐wind speed of 1 m·s − 1 , collecting 66 mL of water meeting drinking water standards in 20 min under moderate humidity of 73%, while powering a thermohydrometer, thus enabling full utilization of mist‐wind resources. This study provides a promising strategy for utilizing mist‐wind resources to alleviate water scarcity and power shortages, promoting sustainable development.