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Article Dans Une Revue Journal of Chemical Physics Année : 2020

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

Ewa Kowalska
Bunsho Ohtani
Daniel Bahena Uribe
Christophe Colbeau-Justin
Sven Rau
José Luis Rodríguez-López
Hynd Remita

Résumé

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.

Domaines

Chimie

Dates et versions

hal-04294309 , version 1 (19-11-2023)

Identifiants

Citer

Maria Guadalupe Méndez-Medrano, Ewa Kowalska, Bunsho Ohtani, Daniel Bahena Uribe, Christophe Colbeau-Justin, et al.. Heterojunction of CuO nanoclusters with TiO2 for photo-oxidation of organic compounds and for hydrogen production. Journal of Chemical Physics, 2020, 153 (3), ⟨10.1063/5.0015277⟩. ⟨hal-04294309⟩

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