Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties

doi:10.1021/jp7097476

IMR OpenIR

	Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties
	Cheng, X. F.1; Leng, W. H.1; Liu, D. P.1; Xu, Y. M.1; Zhang, J. Q.1; Cao, C. N.1,2
通讯作者	Leng, W. H.(lengwh@css.zju.edu.cn)
	2008-06-12
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 TiO2 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 TiO2 is Presented. The sample was prepared by anodization of TiO2 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 TiO2 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-TiO2 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-TiO2 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 TiO2 electrode has an excellent stability against fluoride desorption.
DOI	10.1021/jp7097476
收录类别	SCI
语种	英语
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000256492500039
出版者	AMER CHEMICAL SOC
引用统计	被引频次：122[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/93723
专题	中国科学院金属研究所
通讯作者	Leng, W. H.
作者单位	1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China 2.Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect Met, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Cheng, X. F.,Leng, W. H.,Liu, D. P.,et al. Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2008,112(23):8725-8734.
APA	Cheng, X. F.,Leng, W. H.,Liu, D. P.,Xu, Y. M.,Zhang, J. Q.,&Cao, C. N..(2008).Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties.JOURNAL OF PHYSICAL CHEMISTRY C,112(23),8725-8734.
MLA	Cheng, X. F.,et al."Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties".JOURNAL OF PHYSICAL CHEMISTRY C 112.23(2008):8725-8734.