期刊
OPTICAL MATERIALS
卷 127, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2022.112252
关键词
TiO2 nanotube arrays; SnO2 nanoparticles; Heterojunction; PEC degradation
资金
- National Natural Science Foundation of China [21676213, 11974276and 22078261]
- Natural Science Basic Research Program of Shaanxi [2020JM-422]
- Key Science and Technology Innovation Team of Shaanxi Province [2022TD-33]
A high-efficiency Z-scheme SnO2/TiO2 nanotube arrays (NTAs) were synthesized using a facile solvothermal method, showing improved photoelectrocatalytic activity and stable performance in degrading organic dyes such as MB and RhB. The enhanced PEC performance is attributed to a Z-scheme charge transfer route, inhibiting charge recombination and maintaining strong redox capacity.
Herein, an efficient Z-scheme SnO2/TiO2 nanotube arrays (NTAs) was synthesized through a facile solvothermal method. The investigation indicates that SnO2 can improve the photoelectrocatalytic (PEC) activity of TiO2 NTAs, the photocurrent density of 0.07-SnO2/TiO2 NTAs can reach 0.94 mA cm(-2), which is 4.48 times higher than that of TiO2 NTAs. The PEC degradation efficiency of MB and RhB (5 mg.L-1) is 94.71% and 80.58% over 0.07-SnO2/TiO2 NTAs after 90 min under 300 W Xe lamp irradiation, and the film-shaped 0.07-SnO2/TiO2 NTAs maintains a stable PEC performance during four times of recycling without a complex separation process. Based on the energy band structures analysis and the radical trapping experiments, the boosted PEC activity is benefited from a Z-scheme charge transfer route between SnO2 and TiO2 NTAs, which can inhibit the charge recombination and maintain the strong redox capacity of electrons and holes. This work provides a simple way to construct film-shaped TiO2 based heterojunction in PEC technology for environmental pollution remediation.
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