Plasmonic silver nanoparticles matched with vertically aligned nitrogen-doped titanium dioxide nanotube arrays for enhanced photoelectrochemical activity

The plasmonic Ag nanoparticles match with vertically aligned N-doped TiO sub(2) nanotube arrays, which display improving photoelectrochemical performance. N-doped anatase nanotube arrays are fabricated firstly, and then cubic Ag nanoparticles of diameter 5 nm are deposited on TiO sub(2) nanotubes wi...

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Bibliographic Details
Published in:Journal of power sources 2015-01, Vol.274, p.464-470
Main Authors: Jiao, Jiqing, Tang, Jianguo, Gao, Wei, Kuang, Daibin, Tong, Yexiang, Chen, Liuping
Format: Article
Language:English
Subjects:
Alignment
Arrays
Nanoparticles
Nanostructure
Photocurrent
Photoelectric effect
Plasmonics
Silver
Titanium dioxide
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Summary:The plasmonic Ag nanoparticles match with vertically aligned N-doped TiO sub(2) nanotube arrays, which display improving photoelectrochemical performance. N-doped anatase nanotube arrays are fabricated firstly, and then cubic Ag nanoparticles of diameter 5 nm are deposited on TiO sub(2) nanotubes without organic additives at room temperature. X-ray photoelectron spectroscopy shows that the oxygen vacancies and N impurity are revealed in N-doped TiO sub(2). The electrical properties of samples are investigated by systematic photoelectrochemical measurement. The charge transfer ability of TiO sub(2), N-doped TiO sub(2) and Ag/N-doped TiO sub(2) is presented directly by Electrochemical impedance spectroscopy and Mott-Schottky measurement, respectively. The carrier density of Ag/N-doped TiO sub(2) is higher 2 orders of magnitude enhancement of TiO sub(2). Furthermore, its photocurrent responds rapidly with illumination owing to fast photoelectron transport. And photocurrent density is 0.14 mA cm super(-2) at 1.23 V sub(RHE). which is the highest among samples. Finally, the mechanism of improving photoelectrochemical activity is schematically displayed. The plasmonic Ag/N-doped TiO sub(2) composties are favorable for the separation for photoelectron-hole pairs and increasing electron transfer, leading to a considerably photoelectrochemical performance under sunlight. The modified nanotube arrays provide potential application in photoelectrochemical cell.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2014.10.074