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Highly Selective, Defect-Induced Photocatalytic CO<sub>2</sub> Reduction to Acetaldehyde by the Nb-Doped TiO<sub>2</sub> Nanotube Array under Simulated Solar Illumination

Xinzhu QianSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, P. R. ChinaWeiyi YangKey Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. ChinaShuang GaoKey Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. ChinaJun XiaoShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. ChinaSwastik BasuDepartment of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United StatesAnthony YoshimuraDepartment of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United StatesYunfeng ShiDepartment of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United StatesVincent MeunierDepartment of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United StatesQi LiKey Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China

2020en

ABI

Annotatsiya

The adsorption and activation of CO2 molecules on the surface of photocatalysts are critical steps to realize efficient solar energy-induced CO2 conversion to valuable chemicals. In this work, a defect engineering approach of a high-valence cation Nb-doping into TiO2 was developed, which effectively enhanced the adsorption and activation of CO2 molecules on the Nb-doped TiO2 surface. A highly ordered Nb-doped TiO2 nanotube array was prepared by anodization of the Ti–Nb alloy foil and subsequent annealing at 550 °C in air for 2 h for its crystallization. Our sample showed a superior photocatalytic CO2 reduction performance under simulated solar illumination. The main CO2 reduction product was a higher-energy compound of acetaldehyde, which could be easily transported and stored and used to produce various key chemicals as intermediates. The acetaldehyde production rate was over ∼500 μmol·g–1·h–1 with good stability for repeated long-time uses, and it also demonstrated a superior product selectivity to acetaldehyde of over 99%. Our work reveals that the Nb-doped TiO2 nanotube array could be a promising candidate with high efficiency and good product selectivity for the photocatalytic CO2 reduction with solar energy.

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DOI: 10.1021/acsami.0c17174

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