Abstract:

Arrayed porous titaniumdioxide loaded on titanium(TiO2/Ti) was fabricated using the sol-dipping method with polystyrene sphere (PS) arrays as a template. Its morphology and crystal phase composition were characterized by SEM and XRD, and its photoelectrocatalytic performance was studied using open-circuit potential curves, photocurrents with intermittent irradiation, degradation of methyl orange and hydrogen-evolution overpotential. Results show that arrayed porous TiO2/Ti has high catalytic activity because of the photoelectro-synergisitic effect. The degradation rate of methyl orange was 87.1% after reaction for 2.5 h and 97.9% after reaction for 5 h, and it has an apparent reaction rate constant of 0.77 h-1. The hydrogen-evolution overpotential on this material was reduced from -0.81 V to -0.68 V under ultraviolet irradiation.

Key words: Titaniumdioxide, Porous array, Photoelectrocatalysis, Methyl orange degradation, Hydrogen evolution