Titanates are known from their photocatalytic properties, but they need additional catalysts to work efficiently also they have very high electronic conductivity when they are prepared under reducing conditions in the hydrogen flame or under thermal oxidation in high temperature. We prepared these non-stechiometric titanates as materials for visible-light water and/or small organic molecules oxidation.  Specific conditions of synthesis of non-stechiometric titanates, created by oxidation of the metal at high temperature in oxygen flow, allowed to get unique properties of such films like: large surface area, high conductivity, red-shift in the absorption spectrum and stability over large range of pHs. Adding to these properties, the affinity of polyoxometalate (POMs) species to the formed structures,  and their ability to catalyse the water oxydation reaction, the system of TiO_2-x – POM  seems to be suitable for water splitting purposes under visible light irradiation. Morover, these sub-stoechiometric titanium dioxide / titanes films exhibited red-shifted IPCE photo-action spectrum. These results demonstrated the possibility to form defective TiO₂ through thermal oxidation of the titanium metal as alternative to the reduction by H₂.