The Influence of Rutile Particles on Photo-induced Activity of the Sol-gel TiO2/ITO Photo-anode

0451540 - ÚCHP 2016 RIV NL eng J - Journal Article
Morozová, Magdalena - Dytrych, Pavel - Spáčilová, Lucie - Šolcová, Olga
The Influence of Rutile Particles on Photo-induced Activity of the Sol-gel TiO2/ITO Photo-anode.
Research on Chemical Intermediates. Roč. 41, č. 12 (2015), s. 9307-9318. ISSN 0922-6168. E-ISSN 1568-5675.
[Pannonian Symposium on Catalysis /12./. Castle Trest, 16.09.2014-20.09.2014]
R&D Projects: GA TA ČR TA01020804
Institutional support: RVO:67985858
Keywords : titanium dioxide * anatase * rutile
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 1.833, year: 2015

The rutile effect on the structural and photo-electrochemical properties and the photoinduced activity was studied. The thin TiO2 layers were prepared by the sol-gel method using a reverse micelles system as a molecular template and deposited on the conductive ITO substrate by a dip-coating technique. Pure anatase or mixed anatase/rutile phase were obtained during the calcination step as a result of the selected temperature. The crystallographic structure was determined by Raman spectroscopy and XRD analysis. The positive influence of the presence rutile particles in the thin layer on the photo-induced properties was verified. It was found that the mixed crystallographic phase of anatase and rutile can exhibit a much higher photoinduced activity than pure anatase or the pure rutile form. The reason is that the excited electrons can easily transfer from the anatase surface states to rutile as well as from the anatase conduction band to rutile, which improves the electron-transfer rate. The electron transport between connected anatase and rutile particles can support the photo-excited charge separation and thus reduce the recombination rate.
Permanent Link: http://hdl.handle.net/11104/0254827