Unlocking Scalable Manufacturing of Electrochromic Windows: Wadsley‐Roth TiNb ₂ O ₇ Films with Open Shear Channels for Intelligent Photo‐Thermal Management

Abstract Electrochromic smart windows represent a promising technology for reducing building energy consumption through dynamic photo‐thermal regulation. However, scalable fabrication of high‐performance electrochromic films remains challenging. Herein, we pioneer slot‐die coating technique and aqueous inks for the high‐speed production (600 cm 2 /min) of Wadsley‐Roth structure TiNb 2 O 7 films. Experimental and theoretical analyses reveal that the open crystallographic shear channels in TiNb 2 O 7 enable efficient ion transport with a low diffusion barrier of 0.22 eV, allowing it to achieve a high diffusion coefficient (6.34 × 10 −10 cm 2 /s), good uniformity, and 82.8% large optical modulation at 600 nm. We constructed a series of large‐scale electrochromic devices with a size up to 200 cm 2 that demonstrate significant optical modulation (64.6%), rapid switching (23.4/12.4 s), and uniform coloration. We evaluated the photo‐thermal management performance of the device using a xenon lamp as a simulated solar source, achieving a notable temperature regulation of 18.8°C. To further validate its practical applicability, we conducted an outdoor test, demonstrating a temperature modulation of ∼5.0°C. Additionally, energy simulation analyses reveal that the device enables an energy saving of 155 MJ·m −2 . This work provides a scalable manufacturing strategy for high‐performance electrochromic devices, advancing the development of intelligent energy‐saving window technology.