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Enhanced photoelectrochemical and photocatalytic performance of iodine-doped titania nanotube arrays

Abstract

The paper discusses the synthesis and performance of iodine doped titania nanotube arrays exhibited under irradiation. The doping procedure was performed as an additional, electrochemical process carried out after formation of nanotube arrays via anodization of Ti substrate. The optical and structural properties were characterized using Raman, UV-vis, photoluminescence and X-ray photoelectron spectroscopy. The surface morphology and cross-section studies performed by means of the scanning electron microscopy show that the ordered tubular architecture is not influenced by any doping methods. However, iodine doping causes a reduction of bandgap energy and photoluminescence intensity. The nanotubular TiO2 electrodes have been monitored by electrochemical (using cyclic voltammetry and electrochemical impedance spectroscopy) and in-situ UV-vis spectroelectrochemical measurements in contact with an aqueous electrolyte. Collected results show significant differences in electrochemical activity between pure and doped titania exhibited as i.e. change of Mott-Schottky relation or shift in onset potential when a decrease in reflectance is initiated. The photocurrent density reached 155.2 and 142.2 µA cm-2 for iodine doped materials when KI and HIO4 were used as iodine precursors whereas only 25.6 µA cm-2 was registered for pure titania nanotubes under UV-vis illumination. Moreover, doped samples are far more efficient at the photodegradation progress than undoped material leading to decomposition of over 70% of methylene blue used as model organic pollution. Reported studies demonstrate for the first time the detailed optical, electrochemical and photoelectrochemical studies of iodine doped nanotube arrays.

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Details

Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
RSC Advances no. 5, pages 1 - 13,
ISSN: 2046-2069
Language:
English
Publication year:
2015
Bibliographic description:
Siuzdak K., Szkoda M., Sawczak M., Lisowska-Oleksiak A., Karczewski J., Ryl J.: Enhanced photoelectrochemical and photocatalytic performance of iodine-doped titania nanotube arrays// RSC Advances. -Vol. 5, (2015), s.1-13
DOI:
Digital Object Identifier (open in new tab) 10.1039/c5ra08407e
Verified by:
Gdańsk University of Technology

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