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Enhanced photoanode properties of CdS nanoparticle sensitized TiO2 nanotube arrays by solvothermal synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
27606 44032 2013 9 PDF Available
Title
Enhanced photoanode properties of CdS nanoparticle sensitized TiO2 nanotube arrays by solvothermal synthesis
Abstract

We demonstrate the synthesis of CdS-sensitized TiO2 (CdS/TiO2) nanotube arrays via the solvothermal method and describe their enhanced photoelectrochemical properties. Our new approach prevents the clogging of CdS quantum dots (QDs) at the TiO2 nanotube mouth and promotes the uniform deposition of a polycrystalline CdS on the densely aligned TiO2 nanotube arrays (TiO2 NTAs). The deposition of CdS onto the TiO2 NTA can be controlled by the deposition time and the concentration of the precursors. Photoelectrochemical measurements indicate that the electrode synthesized via the solvothermal method can achieve a stable photocurrent density of 5.7 mA/cm2 at 0-V versus Ag/AgCl under AM 1.5 G illumination, which is approximately 10% higher than that prepared using the chemical bath deposition (CBD) method. Solvothermally prepared CdS/TiO2 NTAs exhibit 125-fold enhancement in their photocurrent under visible light compared with bare TiO2 NTAs, indicating facile photogenerated electron transfer from CdS to TiO2. Solvothermally prepared CdS/TiO2 NTAs shows better photostability and longer lifetime of photoelectrons compared to those prepared by CBD method suggesting more favorable CdS–TiO2 NTA interfacial contact. In general, we propose that this methodology can be useful in designing multijunction semiconductor configuration such as coating nanostructures.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Uniform deposition of CdS on TiO2. ► Higher photocurrents. ► Longer lifetime of e−.

Keywords
CdS-sensitized TiO2; Nanotube arrays; Solvothermal method; Photoelectrochemical cell; Water splitting; Photostability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 259, 1 May 2013, Pages 1–9
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us