Integrated System for Photocatalytic Overall Water\nSplitting from Arid Air

H<sub>2</sub> produced through photocatalytic overall water splitting\nrepresents a sustainable energy. However, this approach is geographically\nconstrained by freshwater availability, worsening the crisis in arid\nregions with abundant solar energy. This study introduces a MOF-801-hydrazine-SrTiO<sub>3</sub>:Al (MS) composite for in situ photocatalytic H<sub>2</sub> production using only atmospheric water and sunlight. The MS benefits\nfrom the hygroscopic MOF-801-hydrazine for water capture and the photocatalytic\nSrTiO<sub>3</sub>:Al for H<sub>2</sub> and O<sub>2</sub>. This system\ndemonstrates effective in situ photocatalytic overall atmospheric\nwater splitting in arid conditions, with a moisture adsorption capacity\nof 1.02 g<sub>H<sub>2</sub>O</sub> g<sub>MS</sub><sup>–1</sup> in 60 min at 30% relative humidity, and H<sub>2</sub> and O<sub>2</sub> production rates of 1033.1 and 494.3 μmol h<sup>–1</sup> g<sup><sub>S</sub>–1</sup>, respectively. This approach offers\na novel solution for sustainable H<sub>2</sub> production using natural\nresources, crucial for water-scarce regions.