Progress of hydrogen evolution from water using modified titania under visible light irradiation

Recent progress of hydrogen production under visible light with modified TiO ₂ was briefly reviewed. Hydrogen production by photocatalysis under visible light is a promising route which can resolve both fuel and environmental problems. Modification of TiO ₂, including doping, surface sensitization, and use of composite semiconductor, can extend the energy range of photoexcitation for TiO ₂ system. The mechanism of photoexcitation in visible light and the progress of three TiO ₂ modification methods were analyzed. Progress of hydrogen evolution from water using modified titania under visible light was discussed in detail. Many researches show that ion doping TiO ₂ is the most efficient and stable approach among the three modification methods, so doping becomes a main direction for further researches.