期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 35, 页码 10532-10537出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11791j
关键词
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资金
- National Natural Science Foundation of China [21273164, 21271146]
- open foundation of key laboratory of catalysis and materials science of the State Ethnic Affairs Commission
- Ministry of Education, South-central University for Nationalities
Anatase TiO2 nanocrystals with {101}, {001} or {010} single facets of 90% level exposure were controllably synthesized from potassium titanate (PT) without fluorine and organic capping surfactants, and characterized by X-ray diffraction patterns (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and fast Fourier transformation (FFT). The liquid-phase photocatalytic reduction (O-2(-) generation) and oxidation ((OH)-O-center dot generation) activity orders of anatase TiO2 facets are {001} > {101} > {010} upon removing facet synergetic effect and surface fluorine effect. UV-vis diffuse reflectance spectra (DRS) and photoluminescence (PL) spectra showed that absorbance edge order, and separation efficiency order of photoexcited holes and electrons are {001} > {101} > {010}, which explains the photocatalytic activity order well together with the atomic arrangement of different facets.
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