TiO2纳米管阵列电极的制备及其光电特性

doi:10.3724/SP.J.1077.2010.01145

无机材料学报 ›› 2010, Vol. 25 ›› Issue (11): 1145-1149.DOI: 10.3724/SP.J.1077.2010.01145 CSTR: 32189.14.SP.J.1077.2010.01145

TiO₂纳米管阵列电极的制备及其光电特性

张知宇, 桑丽霞, 鲁理平, 白广梅, 杜春旭, 马重芳

(北京工业大学环境与能源工程学院, 传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室, 北京 100124)

收稿日期:2010-02-26 修回日期:2010-05-11 出版日期:2010-11-20 网络出版日期:2010-11-01
基金资助:
国家自然科学基金(50806003); 北京市自然科学基金(3093018)

Preparation of TiO₂ Nanotube Arrays and Their Photoelectrochemical Properties

ZHANG Zhi-Yu, SANG Li-Xia, LU Li-Ping, BAI Guang-Mei, DU Chun-Xu, MA Chong-Fang

(Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

Received:2010-02-26 Revised:2010-05-11 Published:2010-11-20 Online:2010-11-01
Supported by:
National Nature Science Foundation of China(50806003); Nature Science Foundation of Beijing(3093018)

摘要/Abstract

摘要： 采用声电化学阳极氧化法, 以H₃PO₄/NaF水溶液为电解液, 在20V直流电压下氧化钛箔制得TiO₂纳米管阵列, 其管径约为100nm, 壁厚15~20nm, 管长随氧化时间的增长先增加后减小. 所制TiO₂纳米管阵列电极在空气中经500℃煅烧后, 以高压汞灯为光源, 测得其光电压和平均光电流密度随制备样品的氧化时间的增长而减小, 且光电压降低程度要小于平均光电流密度降低的程度. 通过伏安曲线和Mott-Schottky图分析还可知, 所制样品的电荷转移能力和电荷载流子密度随阳极氧化时间的增长而减小. 这是由于以H₃PO₄/NaF水溶液为电解液, 超声场长时间加速传质过程的同时会引起管状结构的断裂和部分脱落, 从而使得电荷转移阻力增大而影响了光生电荷的传输.

关键词: 声电化学, TiO₂纳米管阵列, 光电特性, 电荷转移

Abstract: TiO₂ nanotube arrays were fabricated by anodization of the Ti foils in aqueous phosphoric acid and sodium fluoride solutions at 20V under ultrasonic field. The resulting nanotubes had the similar tube diameter (100nm) and the similar wall thickness (15-20nm). The tube lengths of the nanotubes anodized for 1h, 3h and 7h were 600, 1000, 900nm, respectively. Employing a 500W high-pressure mercury lamp as the light source, the open-circuit potential and the photocurrent, the flat band potential and the charge carrier densities of TiO₂ nanotubes arrays annealed at 500℃ were analyzed by the open-circuit potential curves, the voltammetry curves and Mott-Schottky plots. The results showed that the photocurrent, the flat band potential, the charge carrier densities of the resultant samples reduced with the increase of oxidation time. The decrease of photocurrent density was more than that of the open-circuit potential. It can be ascribed to partial fracture and detachment of the nanotubes and the growth of the barrier layer with the inrease of anodization time, which led to the augment of the charge transfer resistance and the decrease of the charge carrier densities.

Key words: sonoelectrochemical, TiO₂ nanotube arrays, photoelectrochemistry, charge transfer

中图分类号:

O649

张知宇, 桑丽霞, 鲁理平, 白广梅, 杜春旭, 马重芳. TiO₂纳米管阵列电极的制备及其光电特性[J]. 无机材料学报, 2010, 25(11): 1145-1149.

ZHANG Zhi-Yu, SANG Li-Xia, LU Li-Ping, BAI Guang-Mei, DU Chun-Xu, MA Chong-Fang. Preparation of TiO₂ Nanotube Arrays and Their Photoelectrochemical Properties[J]. Journal of Inorganic Materials, 2010, 25(11): 1145-1149.

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TiO₂纳米管阵列电极的制备及其光电特性

Preparation of TiO₂ Nanotube Arrays and Their Photoelectrochemical Properties

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