Abstract: The present investigation reports the preparation of platinum and nickel doped-anatase multi-nanoporous thin film electrodes. These doped electrodes were prepared from titanium plates by a three step electrochemical method. Investigations concerning degradation of a non-biodegradable azo dye (acid red G) in the presence of these electrodes irradiated by artificial UV-light were carried out. It has been found that the presence of Pt⁴⁺ into TiO₂ can cause a significant increase in the catalytic activity, especially in the photodegradation of the dye. Incorporation of Ni²⁺ was detrimental to this process. Efficiency of metal-doped TiO₂ electrodes was explained on the basis of electroaffinity and the electron work function. It was observed that photocatalytic degradation of the dye was strongly favored in acidic solutions.