Photodecomposition of Liquid Water with TiO2‐Supported Noble Metal Clusters

Rh- and Ru-loaded TiO2-particles were produced from cluster precursors (Rh6(CO)16, Ru3(CO)12) and their activity in mediating H2O-decomposition through band-gap excitation was investigated. Activity increases in the order Ru<RuO2<Rh≃Rh2O3. Bifunctional Rh/RuO2-loaded TiO2 exhibits optimal performance with overall light-to-chemical-energy conversion efficiency of 0.13%. Lack of O2-appearance in the gas phase during photlysis observed with closed systems is due to photo-uptake of O2 by the TiO2-particles. In alkaline solution the capacity for O2-uptake is surprisingly high and the nature of the stored O2 is tentatively identified as a μ-peroxo-bridged Ti-species.

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