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Assessing the photoelectrochemical properties of C, N, F codoped TiO2 nanotubes of different lengths.

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Title: Assessing the photoelectrochemical properties of C, N, F codoped TiO2 nanotubes of different lengths.
Authors: Chatzitakis, Athanasios1, Grandcolas, Mathieu2, Kaiqi Xu1, Sen Mei2, Juan Yang2, Thue Jensen, Ingvild Julie2, Simon, Christian2, Norby, Truls1 truls.norby@kjemi.uio.no
Source: Catalysis Today. Jun2017, Vol. 287, p161-168. 8p.
Subjects: Photoelectrochemistry, Titanium dioxide, Nanostructured materials, Ethylene glycol, Carbon nanotubes, Fluorides
Abstract: The aim of this work has been the photoelectrochemical (PEC) study of nanostructured photoanodes based on TiO2. Highly ordered and well adhered TiO2 nanotubes (TNTs) of different lengths (-2-20 µm) were prepared in a two-step process in ethylene glycol solutions containing fluorides, and detailed XPS analysis showed that they have become co-doped with C, N and F. PEC measurements revealed that increasing surface area is not followed by increase in the photoconversion efficiency, but rather that an optimal balance between electroactive surface area (ESA) and charge carrier concentration exists. TNTs of around 10 µm show the optimum incident photon-to-current efficiency (IPCE) of -33% and an overall photoconversion efficiency of -6.3% under UV illumination of 4 mW cm-2 light intensity. Finally, Mott-Schottky analysis revealed significant frequency dispersion of the estimated space charge layer capacitance, which renders the accurate estimation of the flatband position and charge carrier concentration unreliable. On the other hand, more realistic charge carrier concentrations can be obtained by normalizing the capacitance per ESA. [ABSTRACT FROM AUTHOR]
Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 122364712
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  Data: The aim of this work has been the photoelectrochemical (PEC) study of nanostructured photoanodes based on TiO2. Highly ordered and well adhered TiO2 nanotubes (TNTs) of different lengths (-2-20 µm) were prepared in a two-step process in ethylene glycol solutions containing fluorides, and detailed XPS analysis showed that they have become co-doped with C, N and F. PEC measurements revealed that increasing surface area is not followed by increase in the photoconversion efficiency, but rather that an optimal balance between electroactive surface area (ESA) and charge carrier concentration exists. TNTs of around 10 µm show the optimum incident photon-to-current efficiency (IPCE) of -33% and an overall photoconversion efficiency of -6.3% under UV illumination of 4 mW cm-2 light intensity. Finally, Mott-Schottky analysis revealed significant frequency dispersion of the estimated space charge layer capacitance, which renders the accurate estimation of the flatband position and charge carrier concentration unreliable. On the other hand, more realistic charge carrier concentrations can be obtained by normalizing the capacitance per ESA. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Ethylene glycol
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              Text: Jun2017
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