A Scalable Core‐Sheath Yarn for Transforming Wool Static Nuisance Into Usable Energy for Wearable Electronics

Abstract Wool fibers, commonly used in autumn‐winter clothing, are prone to generating static electricity, leading to discomfort and safety concerns for wearers, thus posing a long‐standing challenge for the textile industry in developing simple and effective anti‐static solutions. Herein, a core‐sheath yarn (CSY) is introduced, produced at a large scale (≈6 m min −1 ) through wrap spinning to transform wool's static nuisance into triboelectric energy. The CSY knitted fabric (CSYF) can simultaneously achieve excellent static elimination half‐life (≈0.21 s) and efficient energy conversion (≈430 V, ≈2.7 µA at 2 Hz). With good dyeability, considerably high flexibility (≈200% stretchability), and exceptional output power (≈740 mW m −2 ), surpassing most yarn‐based triboelectric textiles, CSYF demonstrates applications in power sources and self‐powered sensing. This work offers a dual‐benefit proposal for the green and sustainable conversion and utilization of challenging energy sources.