True Photoreactivity Origin of Ti-Doped Anatase TiO Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets.

Combining the advantages of reactive crystal facets and engineering defects is an encouraging way to address the inherent disadvantages of titanium dioxide (TiO) nanocrystals. However, revealing the true photoreactivity origin for defective TiO with coexposed or predominant exposed anisotropic facets is still highly challenging. Here, the photoreactivity of TiO nanocrystals with respectively predominant exposed {001}, {101}, and {100} facets before and after Ti doping under both ultraviolet and visible light was compared systematically. In detail, the photocatalytic H production for R-TiO-001, R-TiO-101, and R-TiO-100 increased by a factor of 1.34, 2.65, and 3.39 under UV light and a factor of 8.90, 13.47, and 8.72 under visible light. By contrast, the photocatalytic degradation of methyl orange for R-TiO-001, R-TiO-101, and R-TiO-100 increased by a factor of 3.18, 1.42, and 2.17 under UV light and a factor of 4.03, 2.85, and 1.58 under visible light, respectively. The true photocatalytic activity origin for the obtained photoreduction and photo-oxidation ability is attributed to the exposure of more active sites (under-coordinated 5-fold Ti atoms), the facilitated charge transfer among {001}, {101}, and {100} facets, and the Ti energy state with variable doping levels to extend the visible light response. This work hopefully provides significant insights into the photoreactivity origin of defective TiO nanocrystals with anisotropic exposed facets.