Highly Active Rutile TiO2 Nanocrystalline Photocatalysts

Abstract

The controllable synthesis of rutile TiO₂ single crystal particles with the preferential orientation of {111} facets still remains a scientific and technological challenge. Here, we developed a facile route for fabrication of rutile TiO₂ nanorod crystals (RTiO₂NRs) having high ratios of oxidative {111} to reductive {110} surfaces. RTiO₂NRs were synthesized using a peroxo-titanium complex (PTC) approach, which was controlled by changing the Ti/H₂O₂ ratio. The thus obtained RTiO₂NRs revealed a high tendency to agglomerate through orientation-dependent attachment along the {110} facets. This resulted in an increased {111}/{110} surface ratio and led to a markedly improved photocatalytic activity of RTiO₂NR aggregates. The reported findings illustrate the rich potential of the herein proposed facile and energy-efficient synthesis of nanostructured rutile TiO₂-based photocatalysts.

Keywords: Orientation-dependent attachment; Photocatalysis; Rutile nanorods; Self-assembly; TiO2.