Flexible Zinc‐Ion Hybrid Capacitor Based on Interface‐Engineered Textile of Waste Face Masks

Flexible energy storage devices based on textiles have attracted great attention due to their enormous potential in wearable electronics. Herein, flexible zinc‐ion hybrid capacitors (ZHCs) are proposed for wearable systems using waste face masks (WFMs) as the substrate and separator. The WFMs are covered with poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to enhance the surface conductivity. Thereafter, polypyrrole and Zn are grown on the surfaces of WFMs, respectively, by the one‐step electrodeposition method. The flexible ZHC consists of surface‐engineered textiles which can function as the electrode and current collector. The as‐fabricated device possesses excellent specific capacity (105.1 mAh g −1 ), power density (117.8 W kg −1 ), and energy density (84.3 Wh kg −1 ). Besides, it maintains excellent electrochemical performance after 10 000 charge/discharge cycles and 5000 bending cycles. Furthermore, the device is capable of ensuring a stable power supply and driving an electronic meter for nearly a day. This work provides a facile strategy to construct low‐cost textile‐based flexible ZHCs from WFMs.