Understanding rich oxygen vacant hollow CeO2@MoSe2 heterojunction for accelerating photocatalytic CO2 reduction

Jingwen Jiang; Xiaoxiao Zou; Zhiyuan Mei; Sheng Cai; Qi An; Yao Fu; Han Wang; Tingting Liu; Hong Guo

doi:10.1016/j.jcis.2021.12.108

Understanding rich oxygen vacant hollow CeO₂@MoSe₂ heterojunction for accelerating photocatalytic CO₂ reduction

J Colloid Interface Sci. 2022 Apr:611:644-653. doi: 10.1016/j.jcis.2021.12.108. Epub 2021 Dec 20.

Authors

Jingwen Jiang¹, Xiaoxiao Zou¹, Zhiyuan Mei¹, Sheng Cai¹, Qi An¹, Yao Fu¹, Han Wang¹, Tingting Liu¹, Hong Guo²

Affiliations

¹ School of Materials and Energy, Yunnan University, No. 2, Green Lake North Road, Kunming 650091, China.
² School of Materials and Energy, Yunnan University, No. 2, Green Lake North Road, Kunming 650091, China. Electronic address: guohong@ynu.edu.cn.

PMID: 34973659
DOI: 10.1016/j.jcis.2021.12.108

Abstract

Solar-driven CO₂ reduction into gas fuels is desirable for a sustainable carbon cycle. To improve the photocatalytic activity of CO₂RR, the unique rich oxygen (Vo) vacant hollow CeO₂@MoSe₂ is designed. The introduction of Vo is conducive to the capture of electrons by CO₂ and promotes the process of photocatalytic CO₂RR. The heterojunction formed by introducing the narrow band gap semiconductor MoSe₂ increases the absorption range of visible light and improves the separation efficiency of photogenerated carriers. The hollow structure improves the CO₂ adsorption capacity and improves the use of light effect. Therefore, the prepared H-Vo-CeO₂@49.7 wt% MoSe₂ exhibits enhanced photocatalytic activity for CO₂RR. The yield of CH₄ and CO is 10.2 µmol and 33.2 µmol in 4 h. Moreover, the photocatalytic mechanism is discussed through DFT and in-situ DRIFTS. This work provides new insights to the role of Vo in active CO₂ photoconversion and exploits an important application of CO₂ reduction.

Keywords: CeO(2)@MoSe(2); Hollow structure; Oxygen vacancies; Photocatalytic CO(2) reduction.