Is Photooxidation Activity
of {001} Facets Truly Lower
Than That of {101} Facets for Anatase TiO<sub>2</sub> Crystals?
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Abstract
The effect of particle size and active surfaces on photoreactivity
of TiO<sub>2</sub> crystals is investigated in this report. The clarification
of highly active surfaces is the key to understanding the photoreactivity
of anatase TiO<sub>2</sub> crystal and also to morphological control
of photocatalysts with well-defined crystal facets. The anatase TiO<sub>2</sub> single crystals with different percentage of {001} facets
in uniform size, as well as anatase TiO<sub>2</sub> single crystals
with different particles size in same percentage of {001} facets,
are synthesized by carefully controlling the synthesis parameters.
Their photooxiation reactivity results indicate that the underlying
dominant factor for photooxidation activity of anatase TiO<sub>2</sub> crystals is particle size. The photooxidation activity of {001}
facets is greater than that of {101} facets when the crystals size
of anatase TiO<sub>2</sub> is identical. This work would be beneficial
for better understanding the different photocatalytic performance
of different facets of metal oxide crystals in photoreactivity processes
