Méndez-Medrano Maria Guadalupe, Kowalska Ewa, Ohtani Bunsho, Bahena Uribe Daniel, Colbeau-Justin Christophe, Rau Sven, Rodríguez-López José Luis, Remita Hynd
Institut de Chimie Physique, UMR 8000 CNRS, Université Paris-Saclay, 91405 Orsay, France.
Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan.
J Chem Phys. 2020 Jul 21;153(3):034705. doi: 10.1063/5.0015277.
Heterojunctions of small CuO nanoclusters (synthesized by radiolysis) with TiO (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 TiO-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 TiO under visible light, proving the injection of electrons from CuO nanoclusters to the conduction band of TiO-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.
小尺寸CuO纳米团簇（通过辐射分解合成）与TiO（商用P25）的异质结由于CuO纳米团簇约1.7 eV的窄带隙，在可见光照射下的宽波长范围内诱导出光催化活性。研究了这些复合纳米材料的光学、化学和电学性质。研究了裸露的和改性的TiO-P25在水净化（如苯酚和2-丙醇等有机化合物的光氧化）以及可见光照射下制氢方面的光催化性能。时间分辨微波电导率信号表明TiO在可见光下被激活，证明了电子从CuO纳米团簇注入到TiO-P25的导带。改性材料在可见光下表现出高光催化活性。电荷载流子在光还原和光氧化反应中都发挥了重要作用。
