Effect of Tin+ defects on electrochemical properties of highly-ordered titania nanotube arrays

In this paper, highly-ordered TiO2 nanotube (TNT) electrodes fabricated by anodization at 20V in 0.1M Fa degree -based solution were annealed in O2, N2 and CO respectively. The surface properties of the TiO2 electrodes after annealing treatment by different gases were studied by means of photoelectr...

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Bibliographic Details
Published in:Thin solid films 2010-09, Vol.518 (23), p.7152-7155
Main Authors: Xiao, Peng, Fang, Honglin, Cao, Guozhong, Zhang, Yunhuai, Zhang, Xiaoxing
Format: Article
Language:English
Subjects:
Annealing
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Electrodes
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
Exact sciences and technology
Materials science
Methods of nanofabrication
Nanomaterials
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Nanotubes
Photoconduction and photovoltaic effects
photodielectric effects
Photocurrent
Photoelectric effect
Physics
Polarization
Structure and morphology
thickness
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
Titanium dioxide
TNT
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Summary:In this paper, highly-ordered TiO2 nanotube (TNT) electrodes fabricated by anodization at 20V in 0.1M Fa degree -based solution were annealed in O2, N2 and CO respectively. The surface properties of the TiO2 electrodes after annealing treatment by different gases were studied by means of photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the TNT electrodes were investigated by cyclic voltammetry, steady-state polarization and photocurrent response measurements. The results showed that Tin+ (n=0-3) cations and oxygen vacancies existed in the TNT electrode after annealing in CO, leading to a very efficient electron transfer rate of 1.34A-10a degree 3 cm/s. Steady-state polarization measurement and photocurrent response demonstrated that the electrode potential of oxygen evolution reaction (OER) reduced by 20% and the photocurrent response increased by 50% for CO-annealed TNT electrode compared with O2-annealed TNT electrode.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2010.07.056