Abstract
Controlled thermal decomposition of (Rh) 6(CO) 16 clusters in the presence of TiO 2 (anatase) yields highly active catalysts which decompose water under illumination by a solar simulator with an overall light to chemical energy conversion efficiency of 0.12%. In this system escape of oxygen in the gas phase is prevented by O 2-photo-uptake yielding a peroxo-titanium complex, probably μ-peroxo type, which dissolves in 1 M NaOH but remains on the TiO 2 Particle surface under neutral conditions. The cyclic fashion in which these systems operate suggests that the peroxo-complex releases O 2 in a reversible fashion upon flushing with an inert gas. The oxygen carrier function of the TiO 2 particles is confirmed by quantitative titration with permanganate and experiments comparing hydrogen-oxygen recombination under light and in the dark.
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