Construction of a Z-scheme heterojunction photocatalyst with oxygen vacancies using cobalt-alumina-layered double hydroxide dispersed between bismuth oxybromide layers for efficient photocatalytic reduction of carbon dioxide

Kuan Wang; Run-Jing You; Hui Ma; Tong Sun; Zhen-Hong He; Jian-Gang Chen; Huan Wang; Weitao Wang; Yang Yang; Zhao-Tie Liu

doi:10.1016/j.jcis.2023.10.099

Construction of a Z-scheme heterojunction photocatalyst with oxygen vacancies using cobalt-alumina-layered double hydroxide dispersed between bismuth oxybromide layers for efficient photocatalytic reduction of carbon dioxide

J Colloid Interface Sci. 2023 Oct 20;654(Pt B):988-1000. doi: 10.1016/j.jcis.2023.10.099. Online ahead of print.

Authors

Kuan Wang¹, Run-Jing You², Hui Ma³, Tong Sun², Zhen-Hong He², Jian-Gang Chen⁴, Huan Wang², Weitao Wang², Yang Yang², Zhao-Tie Liu⁵

Affiliations

¹ Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China. Electronic address: [email protected].
² Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
³ Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China; State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
⁴ School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
⁵ Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China; School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China. Electronic address: [email protected].

PMID: 39491070
DOI: 10.1016/j.jcis.2023.10.099

Abstract

Under the context of energy shortages and global warming, the photocatalytic reduction of carbon dioxide (CO₂) to carbon monoxide (CO) using simulated sunlight has attracted considerable research attention. Herein, three-dimensional (3D) Z-scheme cobalt-alumina-layered double hydroxide/bismuth oxybromide (CoAl-layered double hydroxide (LDH)/BiOBr) heterojunction photocatalysts with oxygen vacancies were constructed by intercalating two-dimensional CoAl-LDH between BiOBr layers in the mechanical mixing. The conversion of CO₂ in the water phase was greatly improved compared to CoAl-LDH/BiOBr under 300-W xenon light. The transformation efficiency of 23.62 μmol⋅g^-1⋅h^-1 for CoAl-LDH/BiOBr-10 (CBO-10) is 2.96 and 8.34 times that of pure BiOBr and CoAl-LDH, respectively, with CO selectivity in the obtained products reaching as high as 95 %. Furthermore, CBO-10 catalysts exhibited outstanding stability in terms of structure and catalytic performance. The construction of Z-scheme heterojunctions and oxygen vacancies enlarges the photoresponse range of the BiOBr catalyst while reducing the photoelectron-hole recombination efficiency. The unique 3D structure offers more Z-scheme heterojunction interfaces for the separation and transfer of electrons between CoAl-LDH and BiOBr during photoreaction. This study is expected to guide the development of new high-performance photocatalysts and the selective regulation of reduction products.

Keywords: BiOBr; CoAl-LDH; High selectivity; Photocatalytic CO(2) reduction; Z-scheme heterojunction.