The anatase phase of TiO2 has in most cases higher photocatalytic activity than the other crystalline allotropies. Recently several studies have shown that the (001) surface of anatase is more reactive than the thermodynamically stable (101) surface. This implies that anatase structures with dominant {001} crystal facets will exhibit enhanced photocatalytic properties.

In our laboratory, the formation of dominant {001} crystal facets was managed by combining hydrofluoric acid and other non-toxic substances as a capping agent, which facilitates the formation of these crystal facets by lowering their free energy and making them more stable. The anatase structures produced using hydro/solvothermal method are micro/nanoplates and hollow microspheres composed of crystals with {001} dominant facets.

SEM micrograph of TiO2 anatase microcrystals

SEM micrograph of TiO2 anatase microcrystals

SEM micrograph of anatase microspheres

SEM micrograph of anatase microspheres

TEM micrograph of the TiO2 anatase nanocrystals

TEM micrograph of the TiO2 anatase nanocrystals

The TiO2 samples with mentioned morphologies exhibited higher photonic efficiency in NO oxidation and acetaldehyde decomposition than Evonik Degussa P25, which was used as a reference.

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