Construction of dual ligand Ti-based MOFs with enhanced photocatalytic CO2 reduction performance

As a typical titanium based MOF, NH2-MIL-125(Ti) has been widely used as catalyst for photocatalytic CO2 reduction due to its abundant photoactive sites, large surface area and high porosity. However, the CO2 conversion efficiency of NH2-MIL-125(Ti) is still limited due to its weak electron transfer ability. Herein, Zn(II)porphyrin is selected as photosensitizer to directly coordinate with titanium oxo clusters to endow NH2-MIL125(Ti) with a second efficient photoexcitation path to enhance the photocurrent intensity and CO2 adsorption ability, which realizes 11-fold enhancement in the CO2/CO conversion efficiency. It is found that the optimized band structure of the dual ligand Ti-based MOFs (D-TiMOF) after the incorporation of Zn(II)-porphyrin contributes a lot for the enhanced photoelectric conversion ability and CO2 adsorption ability. This research sheds light on designing efficient CO2/CO conversion MOFs based photocatalyst via porphyrin-metal oxo clusters coordination.

Automated summary

In this study, Zn(II) porphyrin was used to coordinate with titanium oxo clusters to enhance the photoelectric conversion ability and CO2 adsorption capacity of NH2-MIL125(Ti), leading to an 11-fold increase in CO2/CO conversion efficiency.