Fully‐Printed TPMS‐Architected Hygroscopic Lattices for High‐Yield Solar‐Powered Atmospheric Water Harvesting

As global water scarcity intensifies, sorption‐based atmospheric water harvesting (SAWH) has emerged as a transformative paradigm for decentralized potable water production. However, conventional salt‐embedded sorbents typically exhibit stochastic porosity. This limits deterministic control over multiscale vapor sorption, diffusion, and retention across disparate length scales, imposing a fundamental performance ceiling. Herein, we report the rational design of hygroscopic matrices based on triply periodic minimal surface (TPMS) architectures, realized through high‐precision digital light processing (DLP) and tailored ink formulations. Optimized ink formulations broaden the compatibility of hygroscopic materials with scalable 3D printing, enabling synergistic engineering of ink chemistry, layer‐resolved photopolymerization, and mathematically defined lattices (Gyroid, Diamond, Split‐P, and Lidinoid). The architected TPMS matrices successfully decouple trade‐offs among printability, salt incorporation, hierarchical porosity, sorption capacity, and cycling durability that remain unattainable in conventional hygroscopic materials. Consequently, these matrices exhibit topology‐enhanced sorption capacity and kinetics, achieving over 3.3 g g −1 under 90% RH with negligible degradation over 50 sorption−desorption cycles. The multi‐cycling SAWH device delivers a daytime productivity of 2.7 L m −2 and sustains 30‐day operation under real sky, with an estimated two‐year payback period. Our work represents the first demonstration of DLP‐printed, TPMS‐guided hygroscopic materials for user‐defined, batch‐fabricated, and economically compatible SAWH applications.