Facilely anchoring Cu2O nanoparticles on mesoporous TiO2 nanorods for enhanced photocatalytic CO2 reduction through efficient charge transfer

Semiconductor-employed photocatalytic CO2 reduction has been regarded as a promising approach for environmental-friendly conversion of CO2 into solar fuels. Herein, TiO2/Cu2O composite nanorods have been successfully fabricated by a facile chemical reduction method and applied for photocatalytic CO2 reduction. The composition and structure characterization indicates that the Cu2O nanoparticles are coupled with TiO2 nanorods with an intimate contact. Under light illumination, all the TiO2/Cu2O composite nanorods enhance the photocatalytic CO2 reduction. In particular, the TiO2/Cu2O-15% sample exhibits the highest CH4 yield (1.35 mu mol g(-1) h(-1)) within 4h irradiation, and it is 3.07 and 15 times higher than that of pristine TiO2 nanorods and Cu2O nanoparticles, respectively. The enhanced photoreduction capability of the TiO2/Cu2O-15% is attributed to the intimate construction of Cu2O nanoparticles on TiO2 nanorods with formed p-n junction to accelerate the separation of photogenerated electron-hole pairs. This work provides a reference for rational design of a p-n heterojunction photocatalyst for CO2 photoreduction. (C) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

In this study, TiO2/Cu2O composite nanorods were successfully fabricated and applied for photocatalytic CO2 reduction, showing enhanced catalytic performance. The TiO2/Cu2O-15% sample exhibited the highest CH4 yield within 4h irradiation, attributed to the formed p-n junction between Cu2O nanoparticles and TiO2 nanorods.