Controlled synthesis and exceptional photoelectrocatalytic properties of Bi2S3/MoS2/Bi2MoO6 ternary hetero-structured porous film

Yajie Chen; Guofeng Wang; Huali Li; Fangfang Zhang; Haiyu Jiang; Guohui Tian

doi:10.1016/j.jcis.2019.07.097

Controlled synthesis and exceptional photoelectrocatalytic properties of Bi₂S₃/MoS₂/Bi₂MoO₆ ternary hetero-structured porous film

J Colloid Interface Sci. 2019 Nov 1:555:214-223. doi: 10.1016/j.jcis.2019.07.097. Epub 2019 Jul 30.

Authors

Yajie Chen¹, Guofeng Wang¹, Huali Li¹, Fangfang Zhang¹, Haiyu Jiang¹, Guohui Tian²

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China.
² Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China. Electronic address: tiangh@hlju.edu.cn.

PMID: 31382140
DOI: 10.1016/j.jcis.2019.07.097

Abstract

In this work, Bi₂S₃/MoS₂/Bi₂MoO₆ hetero-structured porous films were fabricated via a facile anion exchange process using the as-prepared Bi₂MoO₆ nanoflake array film as substrate material. The formation of Bi₂S₃/MoS₂/Bi₂MoO₆ ternary hetero-structured porous film is both thermodynamically controllable and reaction time dependent. Systematic experiments were done to investigate the products at each reaction stage and disclose the relationships between the composite components and reaction temperature and time. The study showed that the energy barrier need to be overpassed when MoS₂ and Bi₂S₃ were simultaneously produced. The optimized Bi₂S₃/MoS₂/Bi₂MoO₆ photoelectrode exhibited significantly higher photoelectrocatalytic efficiency than Bi₂MoO₆, binary Bi₂S₃/Bi₂MoO₆ and Bi₂S₃/MoS₂ photoelectrodes. The remarkable degradation efficiency of the Bi₂S₃/MoS₂/Bi₂MoO₆ photoelectrode comes from the synergy of high quality assembly and heterostructure interfaces between the three components. The optimized film assembly and stepwise band alignment in the ternary heterostructure composite contribute to visible light utilization, transport and separation of charge carriers, mass transport, and accessibility of active sites. The generated active species such as superoxide anions (O₂^-) and holes were detected to promote the decomposition of organic pollutants. The reasonable photoeletrocatalytic degradation mechanism was also proposed.

Keywords: Bi(2)S(3)/MoS(2)/Bi(2)MoO(6); Photoeletrocatalytic degradation; Porous film; Ternary heterostructure composite.