Heterojunction of CuO nanoclusters with TiO2 for photo-oxidation of organic compounds and for hydrogen production

Heterojunctions of small CuO nanoclusters (synthesized by radiolysis) with TiO2 (commercial P25) induced a photocatalytic activity under visible light irradiation in a wide range of wavelengths due to the narrow bandgap of CuO nanoclusters of around 1.7 eV. The optical, chemical, and electrical prop...

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Bibliographic Details
Published in:The Journal of chemical physics 2020-07, Vol.153 (3), p.034705-034705
Main Authors: Méndez-Medrano, Maria Guadalupe, Kowalska, Ewa, Ohtani, Bunsho, Bahena Uribe, Daniel, Colbeau-Justin, Christophe, Rau, Sven, Rodríguez-López, José Luis, Remita, Hynd
Format: Article
Language:English
Subjects:
Catalytic activity
Chemical Sciences
Conduction bands
Current carriers
Electrical properties
Electrical resistivity
Heterojunctions
Hydrogen production
Light irradiation
Nanoclusters
Nanomaterials
Optical properties
Organic compounds
Oxidation
Photocatalysis
Photochemical reactions
Photooxidation
Radiolysis
Titanium dioxide
Water purification
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Summary:Heterojunctions of small CuO nanoclusters (synthesized by radiolysis) with TiO2 (commercial P25) induced a photocatalytic activity under visible light irradiation in a wide range of wavelengths due to the narrow bandgap of CuO nanoclusters of around 1.7 eV. The optical, chemical, and electrical properties of these composite nanomaterials were studied. The photocatalytic properties of bare and modified TiO2–P25 were studied for water purification (photooxidation of organic compounds such as phenol and 2-propanol) and for hydrogen generation under visible light irradiation. Time resolved microwave conductivity signals showed activation of TiO2 under visible light, proving the injection of electrons from CuO nanoclusters to the conduction band of TiO2–P25. The modified materials showed high photocatalytic activity under visible light. The important role of charge-carriers was demonstrated for both photoreduction and photooxidation reactions.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0015277