• controlling the synergistic effect of oxygen vacancies and n dopants to enhance photocatalytic activity of n-doped tio2 by h2 reduction

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1030
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this paper focuses on improving photocatalytic activity of n-doped tio2 photocatalyst for efficiently utilizing solar energy. a simple h2 reduction is found to remarkably enhance the photocatalytic activity of n-doped tio2 for ethylene oxidation under visible light or simulated solar light irradiation. ultraviolet/visible diffuse reflectance spectra (uv/vis drs), x-ray photoelectron spectra (xps) and electron paramagnetic resonance (epr) spectra were employed to characterize the surface properties and chemical states of nitrogen dopants in h2-reduced n-doped tio2. the results reveal that h2 reduction facilitates the creation of oxygen vacancies and ti3+ species in n-doped tio2 but without removal of nitrogen species from catalyst surface. the formed oxygen vacancies and ti3+ species seriously influence electron excitation from doped nitrogen species and subsequently tune the generation of active oxygen species o2radical dot radicals on n-doped tio2. the synergistic effect of oxygen vacancies and doped nitrogen species contributes to the enhancement of photocatalytic activity of n-doped tio2 samples, but the formed ti3+ ions largely suppress the photocatalytic activity.

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