We have designed and fabricated TiO
2 photocatalysts sensitive to visible light, after the suggestions made in the literature as to the photo-induced interfacial charge transfer between a semiconductor and an adsorbed molecular species. Among them, Cu (II)/TiO
2 decomposed 2-propanol to CO
2 via acetone under visible light (>400 nm) with a high quantum efficiency of 8.8%. We speculate that the high performance of the photocatalyst is derived from the photo-produced holes that are generated in the valence band of TiO
2 and contribute to the oxidative decomposition of 2-propanol, and the catalytic reduction of oxygen (presumably multi-electron reduction) by photo-produced Cu (I) species on TiO
2.
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