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Structure, Composition and Morphology of Photoelectrochemically Active TiO2-xNx Thin Films Deposited by Reactive DC Magnetron Sputtering
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
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2004 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 108, no 52, 20193-20198 p.Article in journal (Refereed) Published
Abstract [en]

Films of nitrogen-doped TiO2 were made by reactive DC magnetron sputtering in a mixture of argon, oxygen, and nitrogen. The nitrogen gas ratio Φ was varied in the 0 < Φ < 0.025 range during the depositions, resulting in TiO2-xNx films with 0 ≤ x ≤ 0.022 as determined by X-ray photoelectron spectroscopy. Structural and morphological properties of the films were investigated by X-ray diffraction, atomic force microscopy, and scanning and transmission electron microscopy. Films prepared without nitrogen had a rutile structure, while the nitrogen-doped films were either rutile or anatase depending on Φ being below or above ∼0.007. Deposition rate, effective grain size, root-mean-square roughness, morphology, and optical absorption were also found to depend on Φ. The films were photoelectrochemically active, as reported in an earlier papers of ours [J. Phys. Chem. B 2003, 107, 5709-5716 and J. Phys. Chem. B 2004, 108, 5995-6003].

Place, publisher, year, edition, pages
2004. Vol. 108, no 52, 20193-20198 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91433DOI: 10.1021/jp0368987OAI: oai:DiVA.org:uu-91433DiVA: diva2:164156
Available from: 2004-02-26 Created: 2004-02-26 Last updated: 2017-12-14Bibliographically approved
In thesis
1. In Search of the Holy Grail of Photoelectrochemistry: A Study of Thin Film Electrodes for Solar Hydrogen Generation
Open this publication in new window or tab >>In Search of the Holy Grail of Photoelectrochemistry: A Study of Thin Film Electrodes for Solar Hydrogen Generation
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hydrogen is a wanted energy carrier in a future society less dependent of fossil fuels. This thesis investigates the possibilities of using solar energy to convert water into hydrogen and oxygen, so called artificial photosynthesis. Through this work multiple inexpensive and stable thin film semiconductor electrodes have been produced and used as solar energy absorbers and active sites for direct watersplitting in photoelectrochemical cells. The electrodes have mainly been of nanostructured metal oxide character but also nitrides have been studied. Detailed back ground theory on photoelectrochemistry of semiconductors for hydrogen evolution is given in the summary of the thesis.

Nanostructured WO3 electrodes with a quantum yield close to unity were designed and photoelectrochemically characterized. Hematite, α-Fe2O3, nanorods were synthesized and characterized for the aim of water oxidation. The morphology of the hematite nanorods was found to be in favor of the traditional isotropic nanostructured electrodes. Moreover, a unique porous nitrogen doped TiO2 material, photoactive in visible light, was obtained by reactive sputtering. The nitrogen doped material has interesting photoelectrochemical properties and is also promising for related applications such as pollution degradation by photocatalysis. Polycrystalline indium nitride, InN, was produced by reactive sputtering. Electrodes of the as prepared InN as well as electrodes annealed in nitrogen were studied for the aim of photooxidation of water.

The electrodes studied are interesting candidates as potential watersplitting electrodes in photoelectrochemical cells, even if all had in common that further improvements and optimizations need to be done.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 90 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 945
Keyword
Physics, photoelectrochemistry, watersplitting, artificial photosynthesis, hydrogen, thin film, nanostructured, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-4017 (URN)91-554-5892-0 (ISBN)
Public defence
2004-03-19, Häggsalen, Ångströmlaboratoriet, Lägerhyddsv.1, Uppsala, 10:15 (English)
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Available from: 2004-02-26 Created: 2004-02-26 Last updated: 2014-01-27Bibliographically approved

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Lindquist, Sten-Eric

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