Abstract
The visible light-induced hydrogen production by water splitting reactions was studied by using undoped or Rh(III) Cu(II) -doped, with or without RuO 2 loaded α-Fe 2O 3 at different pH values in the presence of methyl viologen (MV 2+) as an electron relay. Loading with Rh(III) and Cu(II) ions enhances the hydrogen production efficiency of the photocatalyst. Rh(III) is more efficient than Cu(II) in increasing the photocatalytic activity of α-Fe 2O 3 This increased activity is explained on the basis of the role of the metal ions loaded in photogenerated electron-hole separation. Simultaneous loading of RuO 2 and Rh(III) Cu(II) ions further enhances the efficiency. The dark recombination reaction of the evolved hydrogen and oxygen gases has also been investigated and α-Fe 2O 3 is found to be a good catalyst for both formation (on illumination) and recombination (in the dark) of the two gases. A reaction mechanism involving all these observations has been proposed to explain the photocatalytic cleavage of water.
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