We investigated the photocatalytic activity and catalytic oxygen reduction ability by holes in the valence band (VB) of TiO
2 and reduced Cu(II) species, respectively, produced by the interfacial charge transfer from the VB of TiO
2 to grafted Cu(II). Irradiating Cu(II)-grafted TiO
2 photocatalyst with visible-light completely decomposed acetaldehyde gas (1 µmol) into CO
2 (2 µmol).
In situ spectroscopic and electrochemical measurements indicated that Cu species of a lower oxidation state were generated in the absence of O
2. Notably, the generated Cu species converted back to Cu(II) when exposed to O
2, clearly indicating the O
2 reduction activity of such Cu species.
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