Heterostructured TiO2 Nanoparticles/Nanotube Arrays: In Situ Formation from Amorphous TiO2 Nanotube Arrays in Water and Enhanced Photocatalytic Activity

被引：60

作者：

Huo, Kaifu ^{[1
,2
]}

Wang, Hairong ^{[2
]}

Zhang, Xuming ^{[1
]}

Cao, Yue ^{[2
]}

Chu, Paul K. ^{[1
]}

机构：

[1] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

[2] Wuhan Univ Sci & Technol, Sch Met & Mat, Wuhan 430081, Peoples R China

来源：

CHEMPLUSCHEM | 2012年 / 77卷 / 04期

基金：

中国国家自然科学基金;

关键词：

hydrothermal reaction; nanocomposites; photocatalytic activity; photoelectrochemistry; TiO2; EFFICIENCY; CONVERSION; FABRICATION; MORPHOLOGY; ANATASE; PHENOL; PHASE;

D O I：

10.1002/cplu.201200024

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Heterostructured TiO2 nanoparticles/nanotube arrays (NPs/NTAs) are produced from as-anodized amorphous TiO2 nanotube arrays in water at a temperature as low as 90?degrees C. The phase and morphology transformation of the as-anodized amorphous TiO2 nanotube in water can be attributed to a water-induced dissolution and recrystallization mechanism in which the as-anodized amorphous TiO2 NTAs are gradually self-sacrificed, and then spontaneously morphing into the composite NPs/NTAs structure consisting of anatase NPs and thinner amorphous NTs. The composite can be further crystallized into anatase TiO2 NPs/NTAs consisting of anatase NT and anatase NPs by annealing in air at 450?degrees C for 3 hours. The composite anatase TiO2 NPs/NTAs have a surface area that is 1.4 times larger than that of the anatase TiO2 NTAs and possess enhanced photocatalytic activity in the photodecomposition of organic pollutants and water splitting. The photodecomposition rate of the organic pollutant rhodamine B by the anatase TiO2 NPs/NTAs photocatalyst is two times higher than that by the annealed anatase TiO2 NTAs. The enhanced photocatalytic activity of the hererostructured TiO2 NPs/NTAs arises from the large surface area of the TiO2 NPs and superior electron transport in anatase TiO2 NT. The in situ hydrothermal conversion of the microstructure from amorphous TiO2 NTAs into hererostructured TiO2 NPs/NTAs in water is very simple thereby enabling the design and fabrication of highly photoactive one-dimensional TiO2-based functional materials applicable to photocatalysis and solar energy conversion.

引用

页码：323 / 329

页数：7

共 32 条

[1] Efficiency of dye sensitized solar cells based on TiO2 nanotubes filled with nanoparticles [J].

Alivov, Yahya ;

Fan, Z. Y. .

APPLIED PHYSICS LETTERS, 2009, 95 (06)

[2] Titanium flexible photoanode consisting of an array of TiO2 nanotubes filled with a nanocomposite of TiO2 and graphite for dye-sensitized solar cells [J].

Chen, You-Han ;

Huang, Kuan-Chieh ;

Chen, Jian-Ging ;

Vittal, R. ;

Ho, Kuo-Chuan .

ELECTROCHIMICA ACTA, 2011, 56 (23) :7999-8004

[3] Trap-limited electronic transport in assemblies of nanometer-size TiO2 particles [J].

de Jongh, PE ;

Vanmaekelbergh, D .

PHYSICAL REVIEW LETTERS, 1996, 77 (16) :3427-3430

[4] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[5] Titanium oxide nanotube arrays prepared by anodic oxidation [J].

Gong, D ;

Grimes, CA ;

Varghese, OK ;

Hu, WC ;

Singh, RS ;

Chen, Z ;

Dickey, EC .

JOURNAL OF MATERIALS RESEARCH, 2001, 16 (12) :3331-3334

[6] Conversion of sunlight to electric power by nanocrystalline dye-sensitized solar cells [J].

Grätzel, M .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2004, 164 (1-3) :3-14

[7]

Grimes CA, 2009, TIO2 NANOTUBE ARRAYS - SYNTHESIS, PROPERTIES, AND APPLICATIONS, pXIII

[8] Photocatalytic labyrinth flow reactor with immobilized P25TiO2 bed for removal of phenol from water [J].

Grzechulska, J ;

Morawski, AW .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 46 (02) :415-419

[9] Bamboo-Type TiO2 Nanotubes: Improved Conversion Efficiency in Dye-Sensitized Solar Cells [J].

Kim, Doohun ;

Ghicov, Andrei ;

Albu, Sergiu P. ;

Schmuki, Patrik .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (49) :16454-+

[10] Influence of TiCl4 treatment on surface defect photoluminescence in pure and mixed-phase nanocrystalline TiO2 [J].

Knorr, Fritz J. ;

Zhang, Dongshe ;

McHale, Jeanne L. .

LANGMUIR, 2007, 23 (17) :8686-8690

← 1 2 3 4 →