Biomimetic TPMS Structure‐Based Entangled Hydrogel for Efficient Solar‐Driven Atmospheric Water Harvesting

Abstract

Abstract Atmospheric water harvesting (AWH) is emerging as a sustainable and decentralized strategy for producing freshwater. However, achieving rapid AWH remains challenging due to the slow sorption kinetics, especially in the case of thick hygroscopic hydrogels. Here, a TPMS structure‐based entangled hydrogel mesh (TSEHs) is proposed, featuring a hierarchical porous structure that facilitates a high mass transfer coefficient and a significant air‐hygroscopic site interface. The TPMS‐based hierarchical structure endows the TSEHs with rapid sorption‐desorption kinetics. As a result, in comparison to conventional dense hydrogels (CDHs), TSEHs achieve a remarkable reduction in sorption time by 385%. When the thickness of TSEHs increases from 2 to 12 mm, only a slight decrease in equilibrium sorption time is observed, while CDHs exhibit an exponential increase in equilibrium sorption. Furthermore, the rapid water uptake of ultra‐thick TSEHs is demonstrated at 50 mm, which, to the best of the knowledge, represents the largest recorded thickness for hygroscopic gels. Additionally, a continuous solar‐driven TSEH‐based water production prototype is developed, achieving a high water collection rate of 4.89 kg m −2 under 1 sun and showcasing its significant practical potential.