Abstract: This paper describes the preparation of TiO₂ film photocatalyst fixed on the oxygen-diffusion film .The oxygendiffusion film was composed of oxygenadsorption layer and electrocatalyst layer. TiO₂ film was fixed on the electrocatalyst layer. Examination of surface morphology of the TiO₂ film was made using SEM.The rate of photocatalytic oxidation of oxalic acid on the TiO₂ film was characterized by determining COD of the solution,The experiment results showed that the oxygendiffustion film played an important role in enhancing photocatalytic activity of the TiO₂ film .The action of the oxygendiffusion film on TiO₂ photocatalytic reaction was discussed.

Key words: oxygendiffusion, titanium dioxide, film photocatalyst