A) Pt-TiO 2 B) La-TiO 2 Figure S1. Energy dispersive X-ray spectroscopy (EDS) for A) Pt(II)-TiO 2 and B) La-TiO 2 . The spectrum of Pt(II)-doped TiO 2 showed no apparent signals for elemental Pt, which indicates that Pt ions or Pt metal are not located on or near the surface and that they are well incorporated into TiO 2 lattice. In case of the La-doped TiO 2 material, 0.5 ~ 1.0 wt.% of La was detected; this indicates that La ions are located in the near surface region.

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A hybrid photocatalytic system, which is based on a mixed-phase cadmium sulfide matrix composed of nanoparticulate cubic-phase CdS (c-CdS) with average particle diameters of 13 nm and a bandgap energy of 2.6 eV, is coupled with bulk-phase hexagonal CdS (hex-CdS) that has a bandgap energy of 2.3 eV and is interlinked with elemental platinum deposits. The resulting hybrid nanocomposite catalysts are photocatalytically efficient with respect to hydrogen gas production from water with visible light irradiation at λ > 420 nm. Rates of H 2 production approaching 1.0 mmol-H 2 g -1 h -1 are obtained with a c-CdS/Pt/hex-CdS composite photocatalyst, in the presence of a mixed sodium sulfide and sodium sulfite background electrolyte system at pH 14. In contrast, the same composite produces H 2 a rate of 0.15 mmol g -1 h -1 at pH 7 in a water-isopropanol solvent system. The relative order of reactivity for the synthesized hybrid catalysts was found to be c-CdS/ Pt/hex-CdS > Pt/c-CdS/hex-CdS > Pt/hex-CdS > hex-CdS > c-CdS/hex-CdS > quantum-sized c-CdS. A mechanism involving enhanced lifetimes of electron-hole trapping states that are dependent on the surface chemistry of hydrated CdS involving surface hydroxyl (>CdOH) and sulfhydryl groups (>CdSH) are invoked.