Homogenizing In‐Built Electric Field via Curved Conductive Nanonetworks for Electrochromic Fibers with Enhanced Switching Stability

Electrochromic (EC) fibers capable of optical transmission, reflection, and emission modulation are highly desired for promising applications in electronic display, adaptive camouflage, and visual sensation. However, the non‐uniform electric field of the fiber structure and the lack of electrochemically stable transparent conductive electrodes still limit the practical applications of EC fibers. In this work, scalable EC fibers with long‐range modulation performance and electrochemical stability are fabricated using Ag@Au nanowires (AANWs) nanonetwork and parallel dual‐electrode. Benefiting from the electrochemically resistant Au shell layer that inhibits the oxidation of the nanonetwork electrodes, the EC fibers still maintain excellent EC performance even after 300 color changes. The synergistic interaction between the unique AANWs nanonetwork and the parallel dual‐electrode structure enables the 10 m‐long EC fibers to maintain rapid switching speeds and excellent color uniformity. Additionally, the utilization of mechanical looms to weave long EC fibers has facilitated the practical application of EC fibers in wearable displays, adaptive camouflage, and visual sensation. The electrochromic fibers with high electrochemical stability are fabricated continuously by coating transparent curved conductive nanonetworks. The conformal conductive nanonetworks enable an electric field homogenization inside the fibers, providing a general approach for diverse cutting‐edge electrochemical fiber devices, like fiber batteries, fiber transistors, fiber sweat sensors, and fiber supercapacitors.