Electrochemical preparation and characterization of surface-fluorinated TiO(2) nanoporous film and its enhanced photoelectrochemical and photocatalytic properties

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	Electrochemical preparation and characterization of surface-fluorinated TiO(2) nanoporous film and its enhanced photoelectrochemical and photocatalytic properties
	X. F. Cheng; W. H. Leng; D. P. Liu; Y. M. Xu; J. Q. Zhang; C. N. Cao
	2008
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	112 期号:23 页码:8725-8734
摘要	In recent years, surface fluorination of TiO(2) has been demonstrated to be an efficient method for improving its photocatalytic (PC) reactivity toward some pollutants. In this paper, a new and simple method for surface fluorination and porosity-creating of TiO(2) is Presented. The sample was prepared by anodization of TiO(2) in HF aqueous solutions formed by direct thermal oxidization of titanium sheet. The preparation conditions were optimized. The prepared samples were characterized by scanning electron microscopy (SEM), Raman spectroscopy, UV-vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL). The photoelectrochemical (PEC) and photocatalytic (PC) properties of the samples were also investigated. SEM and Raman showed that the anodization made the TiO(2) nanoporous, which consequently increased markedly the specific surface area, but did not change the bulk crystal structure under a certain preparation condition. DRS analysis revealed that the light absorption was decreased after electrochemical etching. The band gap energy narrowed from 3.15 to 3.04 eV. The surface fluorination of the etched-TiO(2) was evidently supported by XPS. Highly enhanced PEC performance and PC activities for the degradation of target pollutants, phenol, methylene blue, and reactive brilliant red on the etched-TiO(2) were observed. The possible reasons for such an improvement were studied in detail by a combination of the abovementioned methods and (photo) electrochemical techniques. It is mainly attributed to the enhanced specific surface area, negative-shifted appearing energy band edges, decreased surface recombination centers, and/or favorable charge transfer rate. The F-containing TiO(2) electrode has an excellent stability against fluoride desorption.
部门归属	[cheng, x. f.; leng, w. h.; liu, d. p.; xu, y. m.; zhang, j. q.; cao, c. n.] zhejiang univ, dept chem, hangzhou 310027, peoples r china. [cao, c. n.] chinese acad sci, inst met res, state key lab corros & protect met, shenyang 110016, peoples r china.;leng, wh (reprint author), zhejiang univ, dept chem, yuquan campus, hangzhou 310027, peoples r china;lengwh@css.zju.edu.cn
关键词	Visible-light Doped Tio2 Photoelectrocatalytic Reaction Impedance Spectroscopy Optical-properties Rutile Electrodes Degradation Fluoride Oxidation Water
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32691
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. F. Cheng,W. H. Leng,D. P. Liu,et al. Electrochemical preparation and characterization of surface-fluorinated TiO(2) nanoporous film and its enhanced photoelectrochemical and photocatalytic properties[J]. Journal of Physical Chemistry C,2008,112(23):8725-8734.
APA	X. F. Cheng,W. H. Leng,D. P. Liu,Y. M. Xu,J. Q. Zhang,&C. N. Cao.(2008).Electrochemical preparation and characterization of surface-fluorinated TiO(2) nanoporous film and its enhanced photoelectrochemical and photocatalytic properties.Journal of Physical Chemistry C,112(23),8725-8734.
MLA	X. F. Cheng,et al."Electrochemical preparation and characterization of surface-fluorinated TiO(2) nanoporous film and its enhanced photoelectrochemical and photocatalytic properties".Journal of Physical Chemistry C 112.23(2008):8725-8734.