A CsPbBr3/TiO2 Composite for Visible‐Light‐Driven Photocatalytic Benzyl Alcohol Oxidation

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 CsPbBr3/TiO2 composite material catalyzes selective benzyl alcohol oxidation to benza...

Full description

Saved in:
Bibliographic Details
Published in:ChemSusChem 2018-07, Vol.11 (13), p.2057-2061
Main Authors: Schünemann, Stefan, van Gastel, Maurice, Tüysüz, Harun
Format: Article
Language:English
Subjects:
action spectrum
Alcohol
alcohols
Benzaldehyde
Benzyl alcohol
Catalysis
Composite materials
Crystal structure
Electron paramagnetic resonance
Electron spin
Illumination
Light emitting diodes
Morphology
Optoelectronics
Oxidation
Perovskites
Photocatalysis
Photovoltaic cells
Scanning electron microscopy
Scanning transmission electron microscopy
Solar cells
Spectrum analysis
Spin resonance
Titanium dioxide
Transmission electron microscopy
X-ray diffraction
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 CsPbBr3/TiO2 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 CsPbBr3 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 CsPbBr3 in terms of morphology and crystal structure under the reaction conditions. This study sheds light on promising new photocatalytic applications of halide perovskites. Remain in light: Halide perovskites are promising for diverse optoelectronic applications. Recently, these materials have also entered the field of photocatalysis. A CsPbBr3/TiO2 composite catalyzes the selective oxidation of benzyl alcohol to benzaldehyde under visible‐light illumination. Spectroscopic studies show that photoexcited electrons from the CsPbBr3 conduction band participate in the reaction through formation of superoxide radicals.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201800679