In situ studies of structural stability and proton conductivity of titanate nanotubes

被引：22

作者：

Gao, Tao ^{[1
]}

Fjeld, Harald ^{[1
]}

Fjellvag, Helmer ^{[1
]}

Norby, Truls ^{[1
]}

Norby, Poul ^{[1
]}

机构：

[1] Univ Oslo, Dept Chem, Ctr Mat Sci & Nanotechnol, N-0315 Oslo, Norway

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2009年 / 2卷 / 05期

关键词：

ANNEALING TEMPERATURE; TIO2; STORAGE; MORPHOLOGY;

D O I：

10.1039/b821532b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Titanate nanotubes were prepared by hydrothermal treatment of anatase TiO2 with concentrated NaOH solution. In situ synchrotron X-ray diffraction studies revealed that the nanotubes are thermally unstable at temperatures above 360 degrees C and can transform directly to anatase via a dehydration and recrystallization process. This indicated that the titanate nanotubes possess an orthorhombic lepidocrocite (gamma-FeOOH)-type layered structure. An aggregate of the as-prepared nanotubes showed an electric conductivity of about 1 x 10(-6) S cm(-1) at 50 degrees C in humid atmospheres. The conductivity depended on humidity of the atmosphere and decreased with increasing temperatures, suggesting that the proton conduction in the titanate nanotubes might correlate with the interlayer H3O+ ions.

引用

页码：517 / 523

页数：7

共 34 条

[1] Formation of titania nanotubes with high photo-catalytic activity [J].

Adachi, M ;

Murata, Y ;

Harada, M ;

Yoshikawa, S .

CHEMISTRY LETTERS, 2000, (08) :942-943

[2]

Alvarez-Ramirez F, 2007, CHEM MATER, V19, P2947, DOI 10.1021/cm0621621

[3] Size effects and nanostructured materials for energy applications [J].

Balaya, Palani .

ENERGY & ENVIRONMENTAL SCIENCE, 2008, 1 (06) :645-654

[4] The effect of hydrothermal conditions on the mesoporous structure of TiO2 nanotubes [J].

Bavykin, DV ;

Parmon, VN ;

Lapkin, AA ;

Walsh, FC .

JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (22) :3370-3377

[5] Stability of aqueous suspensions of titanate nanotubes [J].

Bavykin, DV ;

Friedrich, JM ;

Lapkin, AA ;

Walsh, FC .

CHEMISTRY OF MATERIALS, 2006, 18 (05) :1124-1129

[6] The structure of trititanate nanotubes [J].

Chen, Q ;

Du, GH ;

Zhang, S ;

Peng, LM .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 2002, 58 :587-593

[7] THE SOFT CHEMICAL SYNTHESIS OF TIO2 (B) FROM LAYERED TITANATES [J].

FEIST, TP ;

DAVIES, PK .

JOURNAL OF SOLID STATE CHEMISTRY, 1992, 101 (02) :275-295

[8] Unusual crystallization behaviors of anatase nanocrystallites from a molecularly thin titania nanosheet and its stacked forms: Increase in nucleation temperature and oriented growth [J].

Fukuda, Katsutoshi ;

Ebina, Yasuo ;

Shibata, Tatsuo ;

Aizawa, Takashi ;

Nakai, Izumi ;

Sasaki, Takayoshi .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (01) :202-209

[9] Raman scattering properties of a protonic titanate HxTi2-x/4□x/4O4•H2O (□, vacancy; x=0.7) with lepidocrocite-type layered structure [J].

Gao, Tao ;

Fjellvag, Helmer ;

Norby, Poul .

JOURNAL OF PHYSICAL CHEMISTRY B, 2008, 112 (31) :9400-9405

[10] Topological properties of titanate nanotubes [J].

Gao, Tao ;

Wu, Qinglan ;

Fjellvag, Helmer ;

Norby, Poul .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (23) :8548-8552

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