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A CsPbBr 3 /TiO 2 Composite for Visible‐Light‐Driven Photocatalytic Benzyl Alcohol Oxidation
Author(s) -
Schünemann Stefan,
van Gastel Maurice,
Tüysüz Harun
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800679
Subject(s) - photocatalysis , benzyl alcohol , visible spectrum , composite number , materials science , photochemistry , catalysis , alcohol , chemistry , chemical engineering , organic chemistry , optoelectronics , composite material , engineering
Halide perovskites have attracted great attention in the fields of photovoltaics, LEDs, lasers, and most recently photocatalysis, owing to their unique optoelectronic properties. The all‐inorganic halide perovskite CsPbBr 3 /TiO 2 composite material catalyzes selective benzyl alcohol oxidation to benzaldehyde under visible‐light illumination. The catalyst, which is prepared by a facile wet‐impregnation method, shows very good selectivity towards benzaldehyde (>99 % at 50 % conversion). Action spectra and electron spin resonance (ESR) studies reveal that photoexcited electrons formed within CsPbBr 3 upon visible‐light illumination take part in the reaction via reduction of oxygen to form superoxide radicals. The detailed post‐catalysis characterization by UV/Vis and X‐ray photoelectron spectroscopy, X‐ray diffraction, and high‐angle annular dark‐field scanning transmission electron microscopy studies further demonstrated the good stability of CsPbBr 3 in terms of morphology and crystal structure under the reaction conditions. This study sheds light on promising new photocatalytic applications of halide perovskites.