Anisotropic relaxation of a CuO/TiO2 surface under an electric field and its impact on visible light absorption: ab initio calculations

作者：Li, Lei^*; Li, Wenshi; Ji, Aimin; Wang, Ziou; Zhu, Canyan; Zhang, Lijun; Yang, Jianfeng; Mao, Ling-Feng

来源：Physical Chemistry Chemical Physics, 2015, 17(27): 17880-17886.

DOI：10.1039/c5cp02010g

• PHOTOCATALYTIC HYDROGEN-PRODUCTION
• POPULATION ANALYSIS
• NANOTUBE ARRAYS
• TIO2 NANOSHEETS
• WATER
• CU
• HETEROJUNCTION
• DEGRADATION
• CU2O/TIO2
• PHOTODEGRADATION

Ab initio calculations on the anisotropic relaxation of a CuO/TiO2 surface under electric fields and the visible light absorption of these relaxed surfaces are reported. We compare the relaxation of the CuO/TiO2 surface under the electric fields in the direction of [001] or [010]. Fewer Cu-O bonds with highly coordinated Cu-ions are found in the CuO/TiO2 relaxed surface under the electric field in the [010] direction. The Cu-O bonds in the interface of the CuO/TiO2 surface led to an improved visible light absorption in the polarization direction of [001]. The CuO/TiO2 relaxed surface under the electric field in the [010] direction exhibits a more effective absorption of visible light. However, the electric field in the [001] direction induces more relaxation on the CuO/TiO2 surface, breaking the Cu-O bonds. This leads to the partial reduction of CuO to Cu2O on the CuO/TiO2 relaxed surface under the electric field in the [001] direction and inefficient absorption of visible light is observed for this surface.

• 出版日期2015
• 单位苏州大学