Asymmetric zinc porphyrin-sensitized nanosized TiO2 for efficient visible-light-driven CO2 photoreduction to CO/CH4.

Asymmetric zinc porphyrin (ZnPy) was synthesized and used to sensitize nanosized TiO2. The visible-light-driven activity of CO2 photoreduction to generate CO/CH4 in the gas phase was observed from the ZnPy-sensitized TiO2 without loading noble metal, and the mechanism was discussed.