Journal
APPLIED SURFACE SCIENCE
Volume 607, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.155023
Keywords
Hydrogenated anatase TiO 2 thin films; DC reactive magnetron sputtering; Photoelectrochemical water splitting; Structural properties; DFT
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This study investigated the hydrogenation process and photoactivity improvement of anatase TiO2 thin films produced by direct-current reactive magnetron sputtering. The structural changes and enhanced photoactivity were found to be related to the formation of defects at the surface of the hydrogenated films.
Hydrogenation has become one of the most used strategies to improve the photoactive properties of titanium dioxide nanomaterials, n-TiO2. In order to obtain more information about the hydrogenated process on anatase TiO2 thin films and the improvement of the photoactivity of this material, we report a study on the structural changes of hydrogenated anatase thin films produced by direct-current reactive magnetron sputtering. In the first stage of the hydrogenation process, the obtained polycrystalline anatase films present an increment of the {0 0 1} facet according to the amount of hydrogen used in the plasma reaction. At higher hydrogen concentrations, amorphous and rutile phases start to appear. The photoactivity of the hydrogenated anatase samples, H:TiO2, presents a redshift of the photoelectrochemical onset and an increase of the reactivity in the UV region. Both results were experimentally and theoretically related to the formation of defects such as oxygen vacancies and TiH/Ti-OH bonds at the surface of the hydrogenated thin films.
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