TiO 2 /WO 3 hybrid structures were produced on graphite substrates following a three step procedure: (i) electrochemical deposition of WO 3 under potentiostatic conditions, (ii) electrochemical deposition of TiO 2 -polyaniline (PANI) composite layers by potentiostatic polymerization of aniline in the presence of TiO 2 nanoparticles, (iii) high temperature (450°C) treatment for decomposition of the PANI structure. Experiments on the photoelectrochemical response of the composite layers were carried out by cyclic voltammetry and chronoamperommetry in the dark and under illumination by using low power lamps emitting in the visible and UV spectrum ranges. The oxidation of three pollutants-oxalate ions, methanol and malachite green was used to evaluate the photoelectrocatalytic activity of the TiO 2 /WO 3 structures. The photocurrents registered for the photooxidation of oxalate were higher than photocurrents measured at hybrid TiO 2 /WO 3 electrodes obtained in conventional two-step electrodeposition of WO 3 and subsequently TiO 2 from corresponding salt solutions. The efficiency of the malachite green photodegradation in our experiments was also about two orders of magnitude higher than that obtained in TiO 2 /WO 3 structures synthesized in a conventional way. These results are (very probably) due to the proposed synthetic approach involving PANI polymer layer as an immobilizing matrix and the opportunity to disperse homogeneously TiO 2 nanoparticles on the WO 3 surface provided.

No abstract

No abstract

No abstract