Photocatalysts that respond to visible light (λ< 400 nm) are needed to utilize the main part of the solar spectrum for production of hydrogen energy by splitting water,[1, 2] purification of water and air,[3] and other applications.[4] Traditional visible-light photocatalysts are either unstable upon illumination with light (eg, CdS, CdSe)[5] or have low activity (eg, WO3, Fe2O3).[6] Recently, some UV-active oxides functioned as visible-light photocatalysts by substitutional doping of metals (as in MTiO2 (M= Fe, V, Mn)[7] and NixIn1ÀxTaO4[8]), reduction of TiO2 (as in TiOx (x< 2)),[9] and anion doping with N, C, and S (as in TiO2ÀxNx,[10] TiO2ÀxCx,[11] TaON,[12] and Sm2Ti2O5S2 [13]). However, these doped materials, in general, show a small absorption in the visible-light region, leading to low activities.[14] New and more efficient visible-light photocatalysts are needed to meet the requirements of future environmental and energy technologies driven by solar energy.