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An efficient method for the deposition of ionic platinum species PtO x onto a TiO2 surface was developed on the basis of light-induced activation of the [Pt(NO3)6]2- anion. The deposited PtO x species with an effective Pt oxidation state between +4 and +2 have an oxygen-made environment and include single ion centers PtO n and polyatomic ensembles Pt n O m connected to a TiO2 surface with Pt-O-Ti bonds. The resulting PtO x /TiO2 materials were tested as photocatalysts for the hydrogen evolution reaction (HER) from a water ethanol mixtur