Enhanced photoelectrochemical and photocatalytic performance of iodine-doped titania nanotube arrays
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
RSC Advances
ISSN
2046-2069
EISSN
Wydawca
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
1-13
Numer tomu
5
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
TITANIA NANOTUBE, IODINE DOPING
Streszczenia
Język
Treść
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.
Inne
System-identifier
132448
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