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Monolayer Epitaxial Heterostructures for Selective Visible‐Light‐Driven Photocatalytic NO Oxidation
Author(s) -
Wang Liang,
Xu Kang,
Cui Wen,
Lv Dongdong,
Wang Li,
Ren Long,
Xu Xun,
Dong Fan,
Dou Shi Xue,
Hao Weichang,
Du Yi
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201808084
Subject(s) - heterojunction , materials science , monolayer , epitaxy , bismuth , photocatalysis , stacking , oxide , semiconductor , adsorption , visible spectrum , optoelectronics , chemical engineering , nanotechnology , photochemistry , catalysis , layer (electronics) , chemistry , metallurgy , organic chemistry , engineering
Abstract Construction of vertical heterostructures by stacking two‐dimensional (2D) layered materials via chemical bonds can be an effective strategy to explore advanced solar‐energy‐conversion systems. However, it remains a great challenge to fabricate such heterostructures based on conversional oxide‐based compounds, as they either do not possess a 2D layered structure or are not suitable for epitaxial growth due to large lattice mismatch. Here, a vertical heterostructure of bismuth oxyhalide semiconductors fabricated through a heteroepitaxial anion exchange method is reported. Monolayer Bi 2 WO 6 is epitaxially grown on the exposed surface of BiOI to inhibit photocorrosion and introduce active sites. Theoretical and experimental results reveal that electrons generated under visible‐light irradiation can directly transfer to surface coordinatively unsaturated (CUS) Bi atoms, which contribute to the adsorption and activation of reactant molecules. As a result, the Bi 2 WO 6 /BiOI vertical heterostructures exhibit significantly enhanced visible‐light‐driven NO oxidation activity compared with BiOI and Bi 2 WO 6 .