摘要
Solar-driven CO_(2) methanation is an imperative and promising approach to relieve the global warming and environmental crisis,yet remains a great challenge due to the low reaction efficiency,unsatisfactory selectivity and poor stability.In this work,we demonstrate a facile and efficient strategy to prepare Ru-doped TiO_(2) photocatalyst with tunable oxygen vacancies using the ascorbic acid as a reducing agent for the CO_(2) methanation reaction.The optimal Ru-TiO_(2)-OV-50 exhibits a remarkable CH4production rate of 81.7 mmol g^(-1)h^(-1)with a 100%CH4selectivity under a 1.5 W cm^(-2)light illumination,which is significantly higher than commercial Ru/TiO_(2)and other reported catalysts.We reveal that the superior photocatalytic CO_(2) methanation performance is mainly due to the synergistic effect of Ru doping and TiO_(2) with tunable oxygen vacancies.Impressively,the light rather than thermal effect is confirmed as the main influencing factor by experimental studies.In addition,in situ spectroscopic technology is performed to investigate the CO_(2) methanation reaction pathway.This work will open an avenue to design and prepare highly efficient photocatalyst with tunable oxygen vacancies for CO_(2) conversion and other related applications.
基金
We acknowledge financial support from the National Key R&D Program of China(2020YFA0406103)
NSFC(21725102,51902311,22122506,91961106,22075267,22232003)
Open Funding Project of National Key Laboratory of Human Factors Engineering(SYFD062010K)
Strategic Priority Research Program of the CAS(XDPB14)
Anhui Provincial Natural Science Foun-dation(2008085J05)
Youth Innovation Promotion Association of CAS(2019444)
Users with Excellence Program of Hefei Science Center CAS(2020HSC-UE003)
Fundamental Research Funds for the Central Universities(WK2060000039).The authors thank the support from USTC Center for Micro-and Nanoscale Research and Fabrication.
