Rutile TiO2 thin film electrodes with excellent blocking function and optical transparency

0511963 - ÚFCH JH 2020 RIV GB eng J - Journal Article
Krýsová, Hana - Zlámalová, Magda - Tarábková, Hana - Jirkovský, Jaromír - Frank, Otakar - Kohout, Michal - Kavan, Ladislav
Rutile TiO2 thin film electrodes with excellent blocking function and optical transparency.
Electrochimica acta. Roč. 321, OCT 2019 (2019), č. článku 134685. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GA18-08959S; GA MŠMT(CZ) 8F17001; GA MŠMT(CZ) EF16_013/0001821
Institutional support: RVO:61388955 ; RVO:68378271
Keywords : band alignment * solar-cells * anatase * layers * electrochemistry * water * deposition * thickness
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impact factor: 6.215, year: 2019
Method of publishing: Limited access

Novel facile synthetic procedure is developed to prepare thin (tens of nm) films of TiO2 (rutile) from thin titanium layers on different substrates. The ´electrochemical´ Tauc plot provides more coherent values of the band-gap than the corresponding optical (UV-Vis) spectra. The conduction-band minimum and valence band maximum of our rutile layers are downshifted by ca. 0.2 eV as compared to those of macroscopic single-crystal rutile electrode. The photocurrent onset potentials of water or methanol oxidation are close to the flatband potential, as it is expected from the classical Gartner-Butler model. The blocking quality is monitored by the model redox probes and optimized through the layer thickness and the heat-treatment protocol in the film fabrication. (C) 2019 Elsevier Ltd. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0302193