Citation: ZHANG Sheng-Han, LIANG Ke-Xin, TAN Yu. Preparation of TiO₂ Nanotube Arrays with Different Cerium Mixing Morphology and Their Photoelectrochemical Response in Visible Light[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2726-2732. doi: 10.3866/PKU.WHXB20111131 shu

Preparation of TiO₂ Nanotube Arrays with Different Cerium Mixing Morphology and Their Photoelectrochemical Response in Visible Light

1.
School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, Hebei Province, P. R. China

Received Date: 17 June 2011
Available Online: 19 September 2011
Fund Project: 中央高校基本科研业务费(11QX79)资助项目 (11QX79)

Well-ordered TiO₂ nanotube arrays were prepared by electrochemical anodization onto a pure Ti sheet in an organic solution. Reduced cerium and oxidized cerium were deposited onto the TiO₂ nanotube arrays by electrochemical cathodic reduction and then anodic oxidation. The morphology and crystalline phase were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), which indicated that the reduced cerium was in the form of elemental cerium nanofibers and they were dispersed over the surface of the TiO₂ nanotube. The oxidized cerium was present as elemental cerium and cerium dioxide after oxidation. The photocurrent was measured and the bandgap energies were calculated. The results showed that the photocurrent response of the TiO₂ nanotube arrays modified by the reduced cerium was enhanced in the visible spectra rather than in the UV spectra. The optimum amount of deposition was found for the sample prepared using the 10 mmol·L^-1 cerium nitrate solution and with a bandgap energy of 2.88 eV. Also, the carrier density increased and the flat band potentials moved to the negative direction as the cerium content increased. After anodic oxidation, the photocurrent response of the samples increased in the visible spectra and in the UV spectra. However, the photocurrent response modified by oxidized cerium in visible spectra is weaker than that of the TiO₂ nanotube arrays modified by reduced cerium.
- TiO₂ nanotube array,
- Cerium,
- Cerium dioxide,
- Co-catalysis,
- Visible light,
- Photocurrent response,
- Semiconductor characteristics
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of TiO2 Nanotube Arrays with Different Cerium Mixing Morphology and Their Photoelectrochemical Response in Visible Light

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通讯作者: 陈斌, bchen63@163.com

Preparation of TiO₂ Nanotube Arrays with Different Cerium Mixing Morphology and Their Photoelectrochemical Response in Visible Light