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Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO 2 nanorod arrays
Author(s) -
Yang Haocheng,
Chen Jinjun,
Zuo Yong,
Zhang Miao,
He Gang,
Sun Zhaoqi
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16460
Subject(s) - nanorod , photocurrent , materials science , photodegradation , photocatalysis , quantum dot , visible spectrum , heterojunction , absorption (acoustics) , bismuth , nanotechnology , optoelectronics , photochemistry , chemical engineering , chemistry , catalysis , composite material , biochemistry , engineering , metallurgy
In this study, TiO 2 nanorod arrays (TNR), Ag quantum dots (QDs) sensitized with TNR TiO 2 /Ag, bismuth oxyhalide (BiOI) nanosheets, and Ag QDs co‐modified with TNR and TiO 2 /BiOI/Ag (TBA) were prepared by a stepwise process. The morphological, structural, compositional, optical, photocatalytic (PC), and photoelectrochemical (PEC) properties of the samples were investigated. The TBA‐2 sample exhibited the highest photocurrent density (281.8 μA/cm 2 ) and photodegradation efficiency (93.3%), with values 9.7 times and 2.25 times higher than those for TNR, respectively. The improvement in sample performance can be attributed to the formation of a heterojunction between BiOI and TiO 2 , thereby enhancing the absorption of visible light and improving the charge separation efficiency; Ag QDs limit interfacial electron‐hole pair recombination. The experimental results show that TBA can effectively promote light‐induced carrier transport and visible light absorption, while inhibiting the recombination rate of the electron‐hole pairs, PEC, and PC.