Cyclic Water Cleavage by Visible Light: Drastic Improvement of Yield of H2 and O2 with Bifunctional Redox Catalysts†

The performance of a new cofunctional redox catalyst which achieves astonishingly high quantum yields in the water splitting process is described. The new catalyst contains Pt and RuO/sub 2/ codeposited on a common carrier, i.e., colloidal TiO/sub 2/.