Photo-Catalytic Hydrogen Generation over TiO2 Film Prepared by Micro-Arc Oxidation Technique

The TiO₂ film was produced on the pure Ti plate substrate in the electrolyte solution of Na₃PO₄ by micro-arc oxidation (MAO) process. The effect of electrolyte concentration, oxidation time and current density on structure, chemical composition of the TiO₂ film had been investigated. It was found that the TiO₂ film was consisted of anatase and the rutile phases. H₂ production activity was examined by photo-catalytic decomposing H₂O over the films in the solution of Na₂S and Na₂SO₃. It was showed from experimental results that the highest H₂ production rate was 0.28 μmol/ h · cm² over the TiO₂ film which was produced under the condition of the electrolyte concentration of 0.11 mol/L, oxidation time of 9 min, current density of 4 A/cm².