A Novel Composite Electrode of Photocatalyst-TiO_2/C Loading on the Surface of the Air (Oxygen) Electrode

摘要

The methods for preparing the H_2O_2 generating air (oxygen) electrode and the composite electrode of photocatalyst-TiO_2/C loading on the surface of the air (oxygen) electrode were introduced. In the case of the composite electrode, the current efficiency of electro-generated H_2O_2 is higher than 80% (J ≤ 15 mA/cm~2). The degradation of aniline was used as an example to measure the influence of the composite electrode and compared with the system in which the air (oxygen) electrode and the photocatalyst-TiO_2 were separated. The results confirmed that the composite electrode played an active role on accelerating the degradation rate of aniline. According to the measurement of the polarization curves of composite electrode and TiO_2 photo anode, and of the adsorbing amount of aniline on the surface of the composite electrode, the principle of descending the recombination rate of photo-generated electron and hole and of enhancing the oxidation rate of organic molecule was described. The mechanism about the degradation of aniline was also discussed.