Abstract
Abstract An attempt is made to prepare Pt/Bi 2 O 3 /RuO 2 (PhC) catalyst and to use it for photocatalytic production of hydrogen from water in the presence of: (i) methyl viologen (MV 2+ ) as an electron relay, (ii) Ru(bpy) 3 2+ as a photosensitizer, or (iii) both (i) and (ii) with visible light of λ ⩾ 400 nm. Compared to the undoped γ-Bi 2 O 3 , the above catalyst is more efficient in hydrogen production. The efficiencies of the different systems constituted by the catalyst with MV 2+ or Ru(bbpy) 3 2+ or both, in hydrogen production are in the order PhC MV 2+ PhC Ru ( bpy ) 2+ 3 PhC MV 2+ Ru ( bpy ) 2+ 3 . Suitable explanations and plausible mechanisms and schemes have been provided to account for the observations in each category of the experiment.
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