Doubling Charge Transport in Z‐Scheme Water Splitting: Di‐Vanadium‐Substituted Polyoxometalate as Shuttle Redox Mediator for Boosting Visible‐Light‐Induced Water Splitting (Adv. Funct. Mater. 44/2025)

Visible-Light-Induced Water Splitting In their Research Article (10.1002/adfm.202505908), Osamu Tomita, Ryu Abe, and co-workers highlight the effect of double redox sites in di-vanadium-substituted polyoxometalates ([SiVV/IVVV/IVW10O40]6−/8−) on Z-scheme water splitting under visible light, in comparison with the mono-vanadium-substituted analogue ([SiVV/IVW11O40]5−/6−). The di-vanadium-substituted polyoxometalates function as efficient electron mediators, facilitating charge transfer between two photocatalysts. These findings offer new insights into designing multi-redox-site polyoxometalates to enhance solar-driven water splitting efficiency.