Photo-reduction of CO2 Using a Rhenium Complex Covalently Supported on a Graphene/TiO2 Composite

作者：Cui, Shi-Cong; Sun, Xue-Zhong; Liu, Jin-Gang^*

来源：Chemsuschem, 2016, 9(13): 1698-1703.

DOI：10.1002/cssc.201600360

• CO2 photoreduction
• graphene oxide
• photocatalyst
• rhenium
• titanium dioxide

One of the promising solutions for decreasing atmospheric CO2 is artificial photosynthesis, in which CO2 can be photoconverted into solar fuels. In this study, a rhenium complex Re(PyBn)(CO)(3)Cl (PyBn=1-(2-picolyl)-4-phenyl-1H-1,2,3-triazole) was covalently grafted onto the surface of reduced graphene oxide (rGO). This was further combined with TiO2 to fabricate a novel catalyst composite TiO2-rGO-Re(PyBn)(CO)(3)Cl for CO2 photo-reduction. This hybrid composite demonstrated high selectivity conversion of CO2 into CO under xenon-lamp irradiation. Compared with the unsupported homogeneous catalyst Re(PyBn)(CO)(3)Cl, the covalent immobilized catalyst composite TiO2-rGO-Re(PyBn)(CO)(3)Cl enhanced the turnover number six times and significantly improved catalyst stability. During the process of CO2 photo-reduction, intermediate species with lifetimes longer than hundreds of microseconds were observed and the formation of CO products was revealed using timeresolved infrared spectroscopy. A plausible mechanism for CO2 photo-reduction by the TiO2-rGO-Re(PyBn)(CO)(3)Cl catalyst composite has been suggested. The obtained results have implications for the future design of efficient catalyst composites for CO2 photo-conversion.

• 出版日期2016-7-7
• 单位华东理工大学