Anatase TiO2 Crystal Facet Growth: Mechanistic Role of Hydrofluoric Acid and Photoelectrocatalytic Activity

doi:10.1021/am200363p

IMR OpenIR

	Anatase TiO2 Crystal Facet Growth: Mechanistic Role of Hydrofluoric Acid and Photoelectrocatalytic Activity
	Zhang, Haimin 1,2; Wang, Yun 1,2; Liu, Porun 1,2; Han, Yanhe 1,2; Yao, Xiangdong 3; Zou, Jin 4; Cheng, Huiming 5; Zhao, Huijun 1,2
通讯作者	Zhao, Huijun(h.zhao@griffith.edu.au)
	2011-07-01
发表期刊	ACS APPLIED MATERIALS & INTERFACES
ISSN	1944-8244
卷号	3 期号:7 页码:2472-2478
摘要	This work reports a facile hydrothermal approach to directly grow anatase TiO2 crystals with exposed {001} facets on titanium foil substrate by controlling pH of HF solution. The mechanistic role of HF for control growth of the crystal facet of anatase TiO2 crystals has been investigated. The results demonstrate that controlling solution pH controls the extent of surface fluorination of anatase TiO2, hence the size, shape, morphology, and {001} faceted surface area of TiO2 crystals. The theoretical calculations reveal that {001) faceted surface fluorination of anatase TiO2 can merely occur via dissociative adsorption of HF molecules under acidic conditions while the adsorption of Na+F- is thermodynamically prohibited. This confirms that the presence of molecular form of HF but riot F- is essential for preservation of exposed {001} facets of anatase TiO2. Anatase TiO2 crystals with exposed {001} facets can be directly fabricated on titanium foil by controlling the solution pH <= 5.8. When pH is increased to near neutral and beyond (e.g., pH >= 6.6), the insufficient concentration of HF ([HF] <= 0.04%) dramatically reduces the extent of surface fluorination, leading to the formation of anatase TiO2 crystals with {101} facets and titanate nanorods/nanosheets. The anatase TiO2 nanocrystals with exposed {001} facets exhibits a superior photoelectrocatalytic activity toward water oxidation. The findings of this work clarify the mechanistic role of HF for controlling the crystal facet growth, providing a facile means for massive production of desired nanostructures with high reactive facets on solid substrates for other metal oxides.
关键词	anatase TiO2 microspheres nanocrystals {001} facets photoelectrocatalysis
资助者	Australian Research Council ; Australian Commonwealth Government
DOI	10.1021/am200363p
收录类别	SCI
语种	英语
资助项目	Australian Research Council ; Australian Commonwealth Government
WOS研究方向	Science & Technology - Other Topics ; Materials Science
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000293196800045
出版者	AMER CHEMICAL SOC
引用统计	被引频次：110[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/321006/106663
专题	中国科学院金属研究所
通讯作者	Zhao, Huijun
作者单位	1.Griffith Univ, Ctr Clean Environm & Energy, Griffith, Qld 4222, Australia 2.Griffith Univ, Griffith Sch Environm, Griffith, Qld 4222, Australia 3.Griffith Univ, QLD Micro & Nanotechnol Ctr, Griffith, Qld 4111, Australia 4.Univ Queensland, Ctr Microscopy & Microanal, Brisbane, Qld 4072, Australia 5.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Haimin,Wang, Yun,Liu, Porun,et al. Anatase TiO2 Crystal Facet Growth: Mechanistic Role of Hydrofluoric Acid and Photoelectrocatalytic Activity[J]. ACS APPLIED MATERIALS & INTERFACES,2011,3(7):2472-2478.
APA	Zhang, Haimin.,Wang, Yun.,Liu, Porun.,Han, Yanhe.,Yao, Xiangdong.,...&Zhao, Huijun.(2011).Anatase TiO2 Crystal Facet Growth: Mechanistic Role of Hydrofluoric Acid and Photoelectrocatalytic Activity.ACS APPLIED MATERIALS & INTERFACES,3(7),2472-2478.
MLA	Zhang, Haimin,et al."Anatase TiO2 Crystal Facet Growth: Mechanistic Role of Hydrofluoric Acid and Photoelectrocatalytic Activity".ACS APPLIED MATERIALS & INTERFACES 3.7(2011):2472-2478.