Constructing CoAl-LDO/MoO3-x S-scheme heterojunctions for enhanced photocatalytic CO2 reduction

Chu-Fan Li; Rui-Tang Guo; Zhen-Rui Zhang; Tong Wu; Yi-Lei Liu; Zong-Chang Zhou; Maitiyasheng Aisanjiang; Wei-Guo Pan

doi:10.1016/j.jcis.2023.07.068

Constructing CoAl-LDO/MoO_3-x S-scheme heterojunctions for enhanced photocatalytic CO₂ reduction

J Colloid Interface Sci. 2023 Nov 15;650(Pt A):983-993. doi: 10.1016/j.jcis.2023.07.068. Epub 2023 Jul 12.

Authors

Chu-Fan Li¹, Rui-Tang Guo², Zhen-Rui Zhang¹, Tong Wu¹, Yi-Lei Liu¹, Zong-Chang Zhou¹, Maitiyasheng Aisanjiang¹, Wei-Guo Pan³

Affiliations

¹ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
² College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai 200090, People's Republic of China; Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry, Shanghai 200090, People's Republic of China. Electronic address: grta@sohu.com.
³ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai 200090, People's Republic of China; Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry, Shanghai 200090, People's Republic of China. Electronic address: pweiguo@163.com.

PMID: 37453322
DOI: 10.1016/j.jcis.2023.07.068

Abstract

Converting CO₂ into chemicals and fuels by solar energy can alleviate global warming and solve the energy crisis. In this work, CoAl-LDO/MoO_3-x (LDO/MO) composites were successfully prepared and achieved efficient CO₂ reduction under visible light. The CoAl-layered double oxides (CoAl-LDO) evolved from CoAl-layered double hydroxide (CoAl-LDH) exhibited a more robust structure, broader light absorption, and improved CO₂ adsorption ability. The local surface plasmon resonance (LSPR) effect excited by nonstoichiometric MoO_3-x broadened the photo-response range of CoAl-LDO/MoO_3-x. In addition, constructing step-scheme (S-scheme) heterojunctions could simultaneously optimize the migration mechanism of photogenerated electrons and holes, and retain carriers with strong redox ability. Therefore, the production rates of CO and CH₄ on the optimal LDO/MO composite were 7 and 9 times higher than the pristine CoAl-LDH, respectively. This work hybridizes oxidation photocatalysts and LDO-based materials to optimize the charge separation and migration mechanisms, which guides the modification of LDO-based materials.

Keywords: CO(2); CoAl-LDO/MoO(3−x); LSPR effect; Photocatalytic reduction; S-scheme heterojunction.