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Photoelectrochemical water splitting (UV-Vis, 2.5 V) from alkaline solution containing cyanide was evaluated in a conventional two-compartment electrochemical cell by using Bi 2 MNbO 7 (M = Al, Fe, Ga, In) films on AISI/SAE 304 stainless steel as photoanode and a silver plate as cathode. The films were prepared by sol-gel dip-coating followed by a thermal treatment at 500°C. They were characterized by scanning electron microscopy, X-ray diffraction and energy dispersive X-ray fluorescence. During the photoelectrochemical process, both circulating current and hydrogen production were measured. Changes in cyanide concentration were determined by potentiometric titration. The activity of Bi 2 MNbO 7 films was higher or equivalent than that of TiO 2 film and dependent on the electrolyte composition and concentration. The obtained results make further work on the subject very encouraging.

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