Fe-TiO2-x/TiO2 S-scheme homojunction for efficient photocatalytic CO2 reduction

Ya-Nan Jing; Xing-Liang Yin; Lei-Lei Li; Yan-Lan Wang; Jia Xue; Ze-Feng Xu; Da-Qiang Liu; Chuan-Wu Chen; Xiao-Jie Liu; Er-Kang Liu

doi:10.1016/j.jcis.2024.04.158

Fe-TiO_2-x/TiO₂ S-scheme homojunction for efficient photocatalytic CO₂ reduction

J Colloid Interface Sci. 2024 Apr 24:668:161-170. doi: 10.1016/j.jcis.2024.04.158. Online ahead of print.

Authors

Affiliations

¹ Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China.
² Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China. Electronic address: xingliangyin@126.com.
³ Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China. Electronic address: 88lileilei@163.com.
⁴ Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China. Electronic address: wangyanlan@lcu.edu.cn.
⁵ Institute of Powder Metallurgy and Advanced Ceramics, University of Science and Technology Beijing, Beijing 100083, PR China. Electronic address: liu18203224277@163.com.

PMID: 38677205
DOI: 10.1016/j.jcis.2024.04.158

Abstract

CO₂-to-high value-added chemicals via a photocatalytic route is of interest but strangled by the low efficiency. Herein, a novel Fe-TiO_2-x/TiO₂ S-scheme homojunction was designed and constructed by using a facile surface modification approach whereby oxygen vacancy (OV) and Fe introducing on the TiO₂ nanorod surface. The as-synthesized Fe-TiO_2-x/TiO₂ S-scheme homojunction exhibits positive properties on promoting photocatalytic CO₂ reduction: i) the nanorod structure provides numerous active sites and a radical charge transfer path; ii) the doped Fe and OV not only synergistically enhance light utilization but also promote CO₂ adsorption; iii) the Fe-TiO_2-x/TiO₂ S-scheme homojunction benefits photoexcited charge separation and retains stronger redox capacity. Thanks to those good characters, the Fe-TiO_2-x/TiO₂ homojunction exhibits superior CO₂ reduction performances with optimized CO/CH₄ generation rates of 122/22 μmol g^-1h^-1 which exceed those of pure TiO₂ by more than 9.4/7.3 folds and most currently reported catalytic systems. This manuscript develops a facile and universal approach to synthesize well-defined homojunction and may inspire the construction of other more high-efficiency photocatalysts toward CO₂ reduction and beyond.

Keywords: CO(2) reduction; Photocatalysis; S-scheme homojunction; Surface modification; Titanium oxide.