| 초록 |
The characteristics of photocatalytic decomposition of water for hydrogen production were studied on the RuS2 supported over TiO2, SiO2, and TiO2-SiO2 mixed oxide. Photocatalysts were characterized by X-ray diffraction (XRD), BET specific surface area, UV-Vis diffuse reflectance spectra (UV-DRS), and the technique of capacitance-voltage (C-V) for investigating the flat band potentials. The highest rate of hydrogen evolution, 25.9 μmol/h was observed over the RuS2(1)/TiO2-SiO2 catalyst, which was prepared by impregnation of 1 wt% RuS2 on TiO2-SiO2 synthesized by sol-gel method. It was found that the flat band potential along with band-gap energy of supports showed strong effects on the photoactivities of resulting catalysts. TiO2-SiO2 mixed oxide that emerges as an outstanding support compared to bare SiO2 and TiO2 is attributable to its high BET specific surface area, band-gap energy, and flat band potential. The effect of sacrificial reagents as electron donors added in reaction solution was also studied. |
