Weavable yarn-shaped moisture-induced electric generator

Moisture-induced electric generation has emerged as a promising powering solution for next-generation wearable electronics since moisture is ubiquitous in the atmosphere. However, the practical applications of current film-shaped generators are limited by the challenge of wearable comfort and large-scale integration into wearables. Herein, we reported a strategy to prepare flexible and high-performance core-shell yarn-shaped moisture-induced electric generator (YMEG) via employing metal wire as the core electrode, polymer-salt solution-treated electrospun nanofiber mats as the active layer, and deposited sliver as the shell electrode. Through the moisture induced interaction between active layer and electrode, the obtained best performance of YMEG with length of 2 cm can produce a highly stable voltage of ∼0.8 V and a current density of 14.3 μA/cm2, reaching the state-of-the-art level among the reported one-dimensional fiber/yarn-shaped MEGs. Furthermore, benefiting from the weavability of YMEG, a dislocation ordered stacking strategy is created for effective integration of YMEG units into fabric, and realizing the simultaneous enhancement of output voltage and current. Such integrated fabric device can work normally under deformation and show successful practical use in power electronics and sensing system, demonstrating great potential to serve as an advanced energy accessory for wearable electronics.