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Plasmonic silver nanoparticles matched with vertically aligned nitrogen-doped titanium dioxide nanotube arrays for enhanced photoelectrochemical activity.
- Source :
-
Journal of Power Sources . Jan2015, Vol. 274, p464-470. 7p. - Publication Year :
- 2015
-
Abstract
- The plasmonic Ag nanoparticles match with vertically aligned N-doped TiO 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 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 2 . The electrical properties of samples are investigated by systematic photoelectrochemical measurement. The charge transfer ability of TiO 2 , N-doped TiO 2 and Ag/N-doped TiO 2 is presented directly by Electrochemical impedance spectroscopy and Mott–Schottky measurement, respectively. The carrier density of Ag/N-doped TiO 2 is higher 2 orders of magnitude enhancement of TiO 2 . Furthermore, its photocurrent responds rapidly with illumination owing to fast photoelectron transport. And photocurrent density is 0.14 mA cm −2 at 1.23 V RHE , which is the highest among samples. Finally, the mechanism of improving photoelectrochemical activity is schematically displayed. The plasmonic Ag/N-doped TiO 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03787753
- Volume :
- 274
- Database :
- Academic Search Index
- Journal :
- Journal of Power Sources
- Publication Type :
- Academic Journal
- Accession number :
- 99790975
- Full Text :
- https://doi.org/10.1016/j.jpowsour.2014.10.074