Activation of CO2 at chromia-nanocluster-modified rutile and anatase TiO2

Band alignment of rutile and anatase TiO2

The most widely used oxide for photocatalytic applications owing to its low cost and high activity is TiO2. The discovery of the photolysis of water on the surface of TiO2 in 19721 launched four decades of intensive research into the underlying chemical and physical processes involved2–5. Despite much collected evidence, a thoroughly convincing explanation of why mixed-phase samples of anatase ...

Raman generation of coherent phonons of anatase and rutile TiO2 photoexcited at fundamental absorption edges

Ultrafast phonon dynamics in anatase and rutile TiO2 single crystals are investigated using 400 nm near ultraviolet light pulses, whose wavelength corresponds to the fundamental absorption edges of both polymorphs. Raman-active phonon modes are observed as coherent modulations in THz frequency range of the reflected light intensity. Coherent amplitudes vary as the crystals are rotated with resp...

Diffusivity and Mobility of Adsorbed Water Layers at TiO2 Rutile and Anatase Interfaces

Molecular-dynamics simulations have been carried out to study diffusion of water molecules adsorbed to anatase-(101) and rutile-(110) interfaces at room temperature (300 K). The mean squared displacement (MSD) of the adsorbed water layers were determined to estimate self-diffusivity therein, and the mobility of these various layers was gauged in terms of the “swopping” of water molecules betwee...

Oxidative trends of TiO2—hole trapping at anatase and rutile surfaces

In situ characterization of the deposition of anatase TiO2 on rutile TiO2(110)