From titanium oxydifluoride (TiOF2) to titania (TiO2): phase transition and non-metal doping with enhanced photocatalytic hydrogen (H-2) evolution properties

Single-crystalline TiOF2 crystals with cubical morphology were prepared via a facile solvothermal method and their transformation to anatase TiO2 under different calcination conditions such as pure argon, moist argon and pure hydrogen sulfide (H2S) was explored by using XRD/Raman/UV-Vis/SEM/TEM/SAED. The non-metal sulfur doping was successfully fulfilled and the doped TiO2 microcubes showed the best photocatalytic H-2 evolution property.