Studies of optical absorption and electron transport in nanocrystalline TiO2 electrodes

被引:49
作者
Shen, Q [1 ]
Toyoda, T [1 ]
机构
[1] Univ Electrocommun, Dept Appl Phys & Chem, Chofu, Tokyo 1828585, Japan
关键词
titanium oxide; photoacoustic; nanostructures; photoelectrochemical current;
D O I
10.1016/S0040-6090(03)00728-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Four kinds of nanostructured titanium dioxide (TiO2) electrodes were prepared by changing the sizes of the TiO2 nanocrystalline particles (15 urn and 27 nm in diameter) and the molecular weight (MW) of the polyethylene glycol (PEG) (MW: 20 000 and 500 000) in TiO2/water paste, which was used for sample preparation. The effects of the sizes of the TiO2 particles and MW of the PEG on the microstructure, optical absorption, photoelectrochemical current (PEC) and electron transport properties of the resultant electrodes were studied. When the size of the TiO2 nanocrystalline particles used in the paste is larger, the porosity and the sizes of the TiO2 nanocrystals produced in the resultant electrodes increases. The TiO2/water paste with different MW of the PEG has different viscosity resulting to different microstructure and electron transport property of the TiO2 electrodes. It was found that the largest PEC current intensity and best electron transport property was obtained when the TiO2 electrode was prepared with the smaller TiO2 nanocrystals (15 nm) and the PEG with MW of 500 000. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:167 / 170
页数:4
相关论文
共 12 条
[1]  
ALMOND DP, 1996, PHOTOTHERMAL SCI TEC, P119
[2]  
[Anonymous], 1991, NATURE
[3]  
Barbe CJ, 1997, J AM CERAM SOC, V80, P3157, DOI 10.1111/j.1151-2916.1997.tb03245.x
[4]   Effects of lithium ion density on electron transport in nanoporous TiO2 electrodes [J].
Nakade, S ;
Kambe, S ;
Kitamura, T ;
Wada, Y ;
Yanagida, S .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (38) :9150-9152
[5]  
NAZZERRUDDIN MK, 1993, J AM CHEM SOC, V115, P6382
[6]   THEORY OF PHOTOACOUSTIC EFFECT WITH SOLIDS [J].
ROSENCWAIG, A ;
GERSHO, A .
JOURNAL OF APPLIED PHYSICS, 1976, 47 (01) :64-69
[7]   Electron transport in the nanostructured TiO2-electrolyte system studied with time-resolved photocurrents [J].
Solbrand, A ;
Lindstrom, H ;
Rensmo, H ;
Hagfeldt, A ;
Lindquist, SE ;
Sodergren, S .
JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (14) :2514-2518
[8]   Photoacoustic and photoluminescence studies of porous silicon etched by low-concentration hydrofluoric acid [J].
Toyoda, T ;
Takahashi, T ;
Shen, Q .
JOURNAL OF APPLIED PHYSICS, 2000, 88 (11) :6444-6450
[9]   Photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO2 films fabricated with different applied voltage treatments [J].
Toyoda, T ;
Hayashi, M ;
Sato, J ;
Shen, Q .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2002, 41 (5B) :3367-3370
[10]   Effect of voltage treatment on modulation frequency dependence of the photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO2 electrodes [J].
Toyoda, T ;
Sato, J ;
Shen, Q .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2001, 40 (5B) :3583-3586