Novel nitrogen precursors for electrochemically driven doping of titania nanotubes exhibiting enhanced photoactivity

Katarzyna Siuzdak; Mariusz Szkoda; Mirosław Sawczak; Anna Lisowska-Oleksiak

doi:10.1039/c5nj00127g

Novel nitrogen precursors for electrochemically driven doping of titania nanotubes exhibiting enhanced photoactivity

Abstract

Nitrogen doped titania nanotubes were successfully sensitized by electrochemical method, i.e. as-anodized titania was immersed in different amine (diethyleneamine-DETA, triethyleneamine-TEA, ethylenediamine-EDA) and urea (U) solution and a constant potential was applied. The highly ordered morphology of fabricated N-TiO2 was investigated by using scanning electron microscopy. Spectroscopic techniques, i.e. UV-Vis spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and photoluminescence spectroscopy were utilized to characterize absorbance capability and the crystalline phase, to confirm the presence of nitrogen atoms and to study charge recombination, respectively. The highest photocurrent under both UV-Vis and visible illumination (λ > 420 nm) was registered for N-TiO2 sample obtained from diethylenetriamine solution, used as a nitrogen precursor. The photocurrent density exhibited during UV-Vis irradiation by the most active nitrogen doped titania was 2.83 times higher compared to pure TiO2 nanotubes. The photocatalytic activity studies, demonstrated a significant improvement when N-TiO2-DETA (52 %) and N-TiO2-U samples (49 %) where used instead of undoped TiO2 (27 %). The presented results show that electrochemical doping with 0.5 M amine or urea solutions is a simple, cheap and effective strategy to introduce nitrogen atoms into the titania structure without affecting its morphology.

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Authors (4)

Katarzyna Siuzdak
- Instytut Maszyn Przepływowych Zakład Fizycznych Aspektów Ekoenergii
Mariusz Szkoda dr inż.
Mirosław Sawczak
- Instytut Maszyn Przepływowych Zakład Fizycznych Aspektów Ekoenergii
Anna Lisowska-Oleksiak prof. dr hab.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: NEW JOURNAL OF CHEMISTRY no. 39, edition 4, pages 2741 - 2751,
ISSN: 1144-0546
Language:: English
Publication year:: 2015
Bibliographic description:: Siuzdak K., Szkoda M., Sawczak M., Lisowska-Oleksiak A.: Novel nitrogen precursors for electrochemically driven doping of titania nanotubes exhibiting enhanced photoactivity // NEW JOURNAL OF CHEMISTRY. -Vol. 39, iss. 4 (2015), s.2741-2751
DOI:: Digital Object Identifier (open in new tab) 10.1039/c5nj00127g
Verified by:: Gdańsk University of Technology