Highly Efficient Photocatalytic CO_(2) Methanation over Ru-Doped TiO_(2) with Tunable Oxygen Vacancies  

作　　者：Zheyue Li Di Wu Wanbing Gong Jiayi Li Shuaikang Sang Hengjie Liu Ran Long Yujie Xiong 

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,School of Chemistry and Materials Science,National Synchrotron Radiation Laboratory,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China [2]Institute of Energy,Hefei Comprehensive National Science Center,350 Shushanhu Rd.,Hefei 230031,China

出　　处：《Chinese Journal of Structural Chemistry》2022年第12期43-50,共8页结构化学（英文）

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.

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.

关 键 词：PHOTOCATALYSIS CO_(2)methanation metal doping titanium oxide oxygen vacancies 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]