Citation: Zheyue Li, Di Wu, Wanbing Gong, Jiayi Li, Shuaikang Sang, Hengjie Liu, Ran Long, Yujie Xiong. Highly Efficient Photocatalytic CO₂ Methanation over Ru-Doped TiO₂ with Tunable Oxygen Vacancies[J]. Chinese Journal of Structural Chemistry, ;2022, 41(12): 221204. doi: 10.14102/j.cnki.0254-5861.2022-0212 shu

Highly Efficient Photocatalytic CO₂ Methanation over Ru-Doped TiO₂ with Tunable Oxygen Vacancies

Zheyue Li ^{1, †} ,
Di Wu ^{1, †} ,
Wanbing Gong ^1,, ,
Jiayi Li ¹ ,
Shuaikang Sang ¹ ,
Hengjie Liu ¹ ,
Ran Long ¹ ,
Yujie Xiong ^{1, 2,,}

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

Corresponding author: Wanbing Gong, wbgong2021@ustc.edu.cn Yujie Xiong, yjxiong@ustc.edu.cn

^†

Received Date: 22 October 2022
Accepted Date: 11 November 2022
Available Online: 16 November 2022

Figures(4)

Solar-driven CO₂ 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 TiO₂ photocatalyst with tunable oxygen vacancies using the ascorbic acid as a reducing agent for the CO₂ methanation reaction. The optimal Ru-TiO₂-OV-50 exhibits a remarkable CH₄ production rate of 81.7 mmol g^-1 h^-1 with a 100% CH₄ selectivity under a 1.5 W cm^-2 light illumination, which is significantly higher than commercial Ru/TiO₂ and other reported catalysts. We reveal that the superior photocatalytic CO₂ methanation performance is mainly due to the synergistic effect of Ru doping and TiO₂ 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 CO₂ methanation reaction pathway. This work will open an avenue to design and prepare highly efficient photocatalyst with tunable oxygen vacancies for CO₂ conversion and other related applications.
- photocatalysis,
- CO₂ methanation,
- metal doping,
- titanium oxide,
- oxygen vacancies
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Highly Efficient Photocatalytic CO₂ Methanation over Ru-Doped TiO₂ with Tunable Oxygen Vacancies