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Photocatalytic reactions on TiO2 have recently gained an enormous resurgencebecause of various new strategies and findings that promise to drasticallyincrease efficiency and specificity of such reactions by modifications of thetitania scaffold and chemistry. In view of geometry, in particular, anodic TiO2nanotubes have attracted wide interest, as they allow a high degree of controlover the separation of photogenerated charge carriers not only inphotocatalytic reactions but also in photoelectrochemical reactions. A keyadvantage of ordered nanotube arrays is that nanotube modifications can beembedded site specifically into the tube wall; that is, cocatalysts, dopingspecies, or junctions can be placed at highly defined desired locations (orwith a desired regular geometry or pattern) along the tube wall. This allows anunprecedented level of engineering of energetics of reaction sites forcatalytic and photocatalytic reactions, which target not only higherefficiencies but also the selectivity of reactions. Many recent tubealterations are of a morphologic nature (mesoporous structures, designedfaceted crystallites, hybrids, or 1D structures), but a number of color-coded(namely, black, blue, red, green, gray) modifications have attracted wideinterest because of the extension of the light absorption spectrum of titaniain the visible range and because unique catalytic activity can be induced. Thepresent Perspective gives an overview of TiO2 nanotubes in photocatalysis withan emphasis on the most recent advances in the use of nanotube arrays anddiscusses the underlying concepts in tailoring their photocatalytic reactivity.

Photocatalysis with TiO2 Nanotubes: Colorful Reactivity and Designing Site-Specific Photocatalytic Centers into TiO2 Nanotubes