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Effect of deposition of Ag nanoparticles on photoelectrocatalytic activity of vertically aligned TiO2 nanotubes

Paper ID Volume ID Publish Year Pages File Format Full-Text
55367 47049 2012 8 PDF Available
Title
Effect of deposition of Ag nanoparticles on photoelectrocatalytic activity of vertically aligned TiO2 nanotubes
Abstract

Deposits of Ag nanoparticles on TiO2 nanotubes have been prepared by ex situ photochemical deposition after substrate impregnation in AgNO3 solution. SEM demonstrated that nanoparticles with average size 40 ± 12 nm are uniformly distributed over the substrate without agglomeration. XPS analysis indicated that concentration of precursor electrolyte allows to control the amount of deposited Ag.For the first time the effect of Ag nanoparticles deposition on photoelectrochemical properties, namely on the photocurrent of water decomposition of TiO2 nanotubes was studied. Depending on the illumination (visible vs. UV–visible), the applied bias, and the amount of deposited Ag, the latter may lead either to an increase or a decrease of photocurrent. Possible origins of the positive and the negative effect of Ag deposition on the photoelectrochemical activity of TiO2 are discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (148 K)Download as PowerPoint slideHighlights► Ag nanoparticles were deposited on aligned TiO2 nanotubes by photodeposition. ► Activity of TiO2 nanotubes in water photodecomposition is effected by deposition of Ag nanoparticles. ► Increase of activity is tentatively explained by improved light absorption, especially in visible range. ► Decrease of activity is related to oxygen electrocatalytic reduction on Ag nanoparticles.

Keywords
Titania nanotubes; Ag photodeposition; Photoelectrochemical cell
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Effect of deposition of Ag nanoparticles on photoelectrocatalytic activity of vertically aligned TiO2 nanotubes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 189, Issue 1, 30 July 2012, Pages 93–100
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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