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题名: Size controllable synthesis of single-crystal ferroelectric Bi4Ti3O12 nanosheet dominated with {001} facets toward enhanced visible-light-driven photocatalytic activities
作者: He, Hongquan; Yin, Jiao; Li, Yingxuan p; Zhang, Ying; Qiu, Hengshan; Xu, Jinbao; Xu, Tao; Wang, Chuanyi
关键词: Molten salt synthesis ; Bi4Ti3O12 ; Photocatalytic ; Ferroelectric ; Internal electric fields
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2014
DOI: 10.1016/j.apcatb.2014.03.003
卷: 156-157, 期:9, 页:35-43
收录类别: SCI
摘要: Highly crystallized single crystal Bi4Ti3O12 nanosheets with dominant {001} facets were synthesized by heating a stoichiometric composition of alpha-Bi2O3 and TiO2 in molten NaCI KCl at 800 C for 2 h. Effects of the amount of the added molten salts (their mole ratio (M) to nominal Bi4Ti3O12 varied from 4 to 60 and the samples were denoted as BTO-M) on the size distribution and photoactivity of the resulting products were systematically evaluated. The side length of as-prepared Bi4Ti3O12 gradually decreases by increasing the addition of molten salts, and the minimal side length is achieved in the sample BTO-50. As a result, the sample BTO-50 shows the best photocatalytic kinetics in photodegradation of rhodamine B (RhB) under visible-light irradiation, which is about 8.65 times faster than that of the sample BTO-0 obtained by a traditional solid-state reaction method, demonstrating the superiority of the present molten salts synthesis for bismuth titanate. The improved photocatalytic kinetics of BTO-M is a concert of several factors including the highly faceted surfaces, thin flakes that shorten the charge transport distance to the surface, as well as the internal electric fields produced by the spontaneous polarization in the BTO-50 sample that facilitate the separation of photoinduced charges as evidenced by Kelvin probe force microscopy. Electrochemical impedance spectroscopy further reveals that under visible-light, the electron transfer resistance of the BTO-50 decreases to nearly 50% of that of the BTO-0 sample. (C) 2014 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3748
Appears in Collections:中国科学院特殊环境功能材料与器件重点试验室_期刊论文

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作者单位: Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Lab Environm Sci & Technol, Urumqi 830011, Xinjiang, Peoples R China;Univ Chinese Acad Sci, Beijing 100049, Peoples R China;No Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA

Recommended Citation:
He, Hongquan,Yin, Jiao,Li, Yingxuan p,et al. Size controllable synthesis of single-crystal ferroelectric Bi4Ti3O12 nanosheet dominated with {001} facets toward enhanced visible-light-driven photocatalytic activities[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2014,156-157(9):35-43.
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