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Boosting Visible‐Light Photocatalytic Redox Reaction by Charge Separation in SnO 2 /ZnSe(N 2 H 4 ) 0.5 Heterojunction Nanocatalysts
Author(s) -
Kim Yeonho,
Jeong DongWon,
Lee Jaewon,
Song Min Young,
Lee Sang Moon,
Choi Jihoon,
Jang DuJeon,
Kim Hae Jin
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000468
Subject(s) - photocatalysis , heterojunction , materials science , redox , boosting (machine learning) , nanomaterial based catalyst , visible spectrum , optoelectronics , photochemistry , inorganic chemistry , nanotechnology , chemistry , catalysis , nanoparticle , metallurgy , biochemistry , machine learning , computer science
In this work, environmentally friendly photocatalysts with attractive catalytic properties are reported that have been prepared by introducing SnO 2 quantum dots (QDs) directly onto ZnSe(N 2 H 4 ) 0.5 substrates to induce advantageous charge separation. The SnO 2 /ZnSe(N 2 H 4 ) 0.5 nanocomposites could be easily synthesized through a one‐pot hydrothermal process. Owing to the absence of capping ligands, the attached SnO 2 QDs displayed superior photocatalytic properties, generating many exposed reactive surfaces. Moreover, the addition of a specified amount of SnO 2 boosted the visible‐light photocatalytic activity; however, the presence of excess SnO 2 QDs in the substrate resulted in aggregation and deteriorated the performance. The spectroscopic data revealed that the SnO 2 QDs act as a photocatalytic mediator and enhance the charge separation within the type II band alignment system of the SnO 2 /ZnSe(N 2 H 4 ) 0.5 heterojunction photocatalysts. The separated charges in the heterojunction nanocomposites promote radical generation and react with pollutants, resulting in enhanced photocatalytic performance.