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

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.