Electrochemical preparation of TiO_2/Si0_2 composite film and its high activity toward the photoelectrocatalytic degradation of methyl orange

摘要

Uniform Ti0_2/Si0_2 composite films were prepared on ITO substrates by electrodeposition, and highly photoelectrocatalytic (PEC) activity of the composite films was observed toward the degradation of methyl orange (MO) in aqueous solutions. It was further found that their PEC activity was dependent on the electrodeposition parameters including deposition time, solution pH and SiO_2 content. Under the optimized condition, the PEC degradation of MO on TiO_2/Si0_2 composite film electrode could be enhanced about 14 times relative to that on neat TiO_2 film electrode. The high PEC activity of the TiO_2/ Si0_2 composite film electrode was mainly attributed to the enhancement of the charge separation of photo-generated electron-hole pairs by the dispersion of Si0_2 nanoparticles in the TiO_2 matrix with the aid of the applied electric field.