Interface‐Induced In Situ Growth of Dense MOF Membrane for Solar‐Assisted Freshwater Collection

ABSTRACT

Moisture collection using physisorbents emerges as a promising approach to alleviate water shortage in arid regions, yet its effectiveness hinges critically on the water‐collecting capability and regeneration efficiency of the adsorbents. Here we introduce a metal–organic framework (MOF) derived membrane tailored for solar‐driven freshwater production, achieved by employing an interface‐induced in situ growth strategy. Based on a stable Al‐MOF, HIAM‐330, which exhibits high water adsorption capacity (405.91 mg g ⁻¹ at 30% RH), we demonstrate the fabrication of a low macroscale defect‐density membrane via in situ growth on hydrophilic‐photothermal substrate directed by the synergistic effect of electrostatic attraction and hydrophilic interactions. The resulting membrane boasts a high MOF loading and showcases rapid solar‐assisted regeneration, achieving a moisture conversion of 87.47% under practical low‐humidity environment. Our strategy of constructing low macroscale defect‐density MOF‐derived membranes offers new insights into optimizing the moisture harvesting efficiency.