Simultaneous production of hydrogen and chlorine through overall brine splitting with a particulate photocatalyst.

Sunlight-driven photocatalytic water splitting shows promise for green H 2 production. In an attempt to achieve seawater splitting, we constructed a new stoichiometric brine splitting system that produces H 2 along with Cl 2 instead of O 2 . Cl 2 -a more potent high-value-added oxidant than O 2 -was obtained with 100% selectivity over 10 h by adjusting the solution pH to acidic using a UV-light-driven Pt-loaded TiO 2 photocatalyst. Our new photosynthesis system can permit economically feasible solar chemical production.