Citation: GONG Cheng, XIANG Siwan, ZHANG Zeyang, SUN Lan, YE Chenqing, LIN Changjian. Construction and Visible-Light-Driven Photocatalytic Properties of LaCoO₃-TiO₂ Nanotube Arrays[J]. Acta Physico-Chimica Sinica, ;2019, 35(6): 616-623. doi: 10.3866/PKU.WHXB201805082 shu

Construction and Visible-Light-Driven Photocatalytic Properties of LaCoO₃-TiO₂ Nanotube Arrays

GONG Cheng ^1,2 ,
XIANG Siwan ^1,2 ,
ZHANG Zeyang ^1,2 ,
SUN Lan ^1,2,, ,
YE Chenqing ² ,
LIN Changjian ¹

1.
State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
2.
Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, Ningde Normal University, Ningde 352100, Fujian Province, P. R. China

Corresponding author: SUN Lan, sunlan@xmu.edu.cn
Received Date: 29 May 2018
Revised Date: 16 July 2018
Accepted Date: 17 July 2018
Available Online: 25 June 2018
Fund Project: the National Natural Science Foundation of China 21621091The project was supported by the National Natural Science Foundation of China (21621091) and Guangdong Natural Science Foundation, China(2016A030313845)Guangdong Natural Science Foundation, China 2016A030313845

TiO₂ nanotube arrays (NTAs) have high photocatalytic activity; however, their weak visible light absorption limits their solar energy utilization and environmental application. Perovskite (ABO₃)-type oxides with a narrow band gap can absorb visible light in a wide wavelength range and have excellent stability; however, their photocatalytic activity is relatively low. Coupling TiO₂ NTAs with ABO₃ to form heterojunctions is one of the most promising approaches to extend the optical absorption of TiO₂ NTAs into the visible-light range and promote the separation rate of photogenerated electron–hole pairs. However, to date, constructing ABO₃-TiO₂ NTA heterostructured composites has been extremely challenging owing to the different crystallization temperatures of anatase TiO₂ NTAs and ABO₃. In this work, LaCoO₃ nanoparticles were first synthesized using a sol-gel method. The as-prepared LaCoO₃ nanoparticles were then modified on the surface of the TiO₂ NTAs using an electrophoretic deposition technique, and a series of LaCoO₃-TiO₂ NTAs photocatalysts were thus constructed by controlling the deposition time. Results of the scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) demonstrated that the nanoparticles prepared through the sol-gel method were LaCoO₃ with a uniform size and high crystallization. The average diameter of the LaCoO₃ nanoparticles was 100 nm. The binding strength between the LaCoO₃ nanoparticles and the TiO₂ NTAs was strong. The UV-visible absorption spectra (diffuse reflectance spectroscopy; DRS) demonstrated that the absorption band edge of the LaCoO₃-TiO₂ NTAs was gradually red-shifted into the visible light region with the increase in electrophoretic time. The LaCoO₃-TiO₂ NTAs prepared by the electrophoretic deposition technique for 15 min exhibited a strong light absorption in the wide wavelength range from 250 to 700 nm, which was the same as that of the LaCoO₃ nanoparticles loaded on a Ti foil. The results of the photocatalytic degradation of methyl orange (MO) under visible light irradiation demonstrated that the photocatalytic degradation rate of MO over LaCoO₃-TiO₂ NTAs was considerably higher than those of TiO₂ NTAs and LaCoO₃ nanoparticles loaded on a Ti foil. The LaCoO₃-TiO₂ NTAs prepared by the electrophoretic deposition technique for 15 min showed the highest photocatalytic degradation rate of MO, which was a four-fold enhancement compared to that of TiO₂ NTs under the same conditions. The p-n heterojunctions between the LaCoO₃ nanoparticles and the TiO₂ nanotubes were responsible for the enhanced visible light photocatalytic activity. The results of the electrochemical impedance spectroscopy (EIS) and photoluminescence spectroscopy (PL) tests demonstrated that the loading of the LaCoO₃ nanoparticles effectively promoted the separation and transport of photogenerated charges, thereby enhancing the visible light photocatalytic activity of the TiO₂ NTAs.
- LaCoO₃,
- TiO₂ nanotube arrays,
- Visible light,
- Photocatalysis,
- Methyl orange
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Construction and Visible-Light-Driven Photocatalytic Properties of LaCoO3-TiO2 Nanotube Arrays

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Construction and Visible-Light-Driven Photocatalytic Properties of LaCoO₃-TiO₂ Nanotube Arrays