CdS/WO3 S-scheme heterojunction with improved photocatalytic CO2 reduction activity

Yuzhen Sun; Yuting Han; Xinyu Song; Bing Huang; Xinlong Ma; Rong Xing

doi:10.1016/j.jphotobiol.2022.112480

CdS/WO₃ S-scheme heterojunction with improved photocatalytic CO₂ reduction activity

J Photochem Photobiol B. 2022 Aug:233:112480. doi: 10.1016/j.jphotobiol.2022.112480. Epub 2022 May 25.

Authors

Yuzhen Sun¹, Yuting Han², Xinyu Song³, Bing Huang⁴, Xinlong Ma⁵, Rong Xing²

Affiliations

¹ Institute of New Energy on Chemical Storage and Power Sources, School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224000, Jiangsu, China. Electronic address: sunyz@yctu.edu.cn.
² Institute of New Energy on Chemical Storage and Power Sources, School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224000, Jiangsu, China.
³ Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China.
⁴ Institute of New Energy on Chemical Storage and Power Sources, School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224000, Jiangsu, China; Jiangsu Province Engineering Research Center for Agricultural Breeding Pollution Control and Resource, Yancheng Teachers University, Yancheng 224007, China.
⁵ State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Changping, Beijing 102249, China. Electronic address: maxl@cup.edu.cn.

PMID: 35717831
DOI: 10.1016/j.jphotobiol.2022.112480

Abstract

The anthropogenic emission of CO₂ in the environment affected our atmosphere, which caused a rapid change in the climate. It needs to reduce the excess CO₂ from the environment to maintain sustainability and keep it green. In this work, we have fabricated a CdS decorated WO₃ nanocomposite, improving the reduction ability of CO₂ into CO and CH₄ selectively in visible light. The construction of the heterojunction improved the stability of CdS with WO₃. It synergistically resulted in ~7.7 times the higher yield of CO and 2.3 times the higher yield of CH₄ than CdS using 20 wt% CdS decorated WO₃ nanocomposite in a mixture of N,N-dimethylformamide, triethylamine, and water in a 3:1:1 ratio. The 20 wt% CdS on WO₃ nanocomposite has proven an effective and selective photocatalyst with the relative yield of methanol up to four cycles. The nanocomposite photocatalysts were analyzed using instrumental techniques, such as XRD, XPS, HR-TEM, FTIR, TGA-DTA, UV-vis, PL spectroscopy, and PEC analysis.

Keywords: CO(2) photoreduction; CdS; Heterojunction; Hydrocarbon fuels; WO(3).