2D Bi2MoO6/Zn3V2O8 heterojunction photocatalyst for efficient photocatalytic reduction of CO2 to CO and CH4

Shiping Li; Najmul Hasan; Fuchun Zhang; Jong-Seong Bae; Chunli Liu

doi:10.1016/j.jcis.2023.08.189

2D Bi₂MoO₆/Zn₃V₂O₈ heterojunction photocatalyst for efficient photocatalytic reduction of CO₂ to CO and CH₄

J Colloid Interface Sci. 2023 Dec 15;652(Pt B):1533-1544. doi: 10.1016/j.jcis.2023.08.189. Epub 2023 Aug 30.

Authors

Shiping Li¹, Najmul Hasan¹, Fuchun Zhang², Jong-Seong Bae³, Chunli Liu⁴

Affiliations

¹ Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea.
² College of Physics and Electronic Information, Yan'an University, Yan'an 716000, People's Republic of China.
³ Busan Center, Korea Basic Science Institute, Busan 46742, Republic of Korea.
⁴ Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea. Electronic address: chunliliu@hufs.ac.kr.

PMID: 37660610
DOI: 10.1016/j.jcis.2023.08.189

Abstract

Two-dimensional (2D) "face-to-face" heterojunctions promote interfacial charge transfer and separation in composite photocatalysts. Here, we report an efficient 2D/2D step-scheme (S-scheme) photocatalyst composed of Bi₂MoO₆/Zn₃V₂O₈ (BMO/ZVO), which has been designed and prepared via the self-assembly of BMO and ZVO nanoflakes. The heterojunction with an optimized composition of 30% BMO/ZVO showed extended light absorption capacity and enhanced separation efficiency of photogenerated carriers. Density functional theory (DFT) calculation on work function and charge density revealed the presence of a built-in electric field at the interface region, which should facilitate the separation of photogenerated electron-hole pairs. This work showed that it is essential to select two photocatalysts with interlaced band arrangement and to fine-tune the heterojunction interface for the preparation of S-scheme heterojunctions to achieve high photocatalytic efficiency.

Keywords: Bi(2)MoO(6)/Zn(3)V(2)O(8); CO(2) reduction; DFT; Heterojunction; Photocatalysis.