Pseudobrookite (Fe2TiO5) films: Synthesis, properties and photoelectrochemical characterization

0567992 - ÚFCH JH 2024 RIV NL eng J - Článek v odborném periodiku
Imrich, T. - Krýsová, Hana - Neumann-Spallart, M. - Krýsa, J.
Pseudobrookite (Fe2TiO5) films: Synthesis, properties and photoelectrochemical characterization.
Catalysis Today. 413-415, MAR 2023 (2023), č. článku 113982. ISSN 0920-5861. E-ISSN 1873-4308
Grant CEP: GA ČR(CZ) GA20-11635S; GA MŠMT(CZ) EF16_013/0001821; GA MŠMT(CZ) LM2018124
Grant ostatní: GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_013/0001821
Institucionální podpora: RVO:61388955
Klíčová slova: pseudobrookite * spray pyrolysis * photoelectrochemistry
Obor OECD: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impakt faktor: 5.3, rok: 2022
Způsob publikování: Omezený přístup

Pseudobrookite, Fe2TiO5, precursor films were obtained by spray pyrolysis (SP) at 550 °C on fused silica and FTO (F-doped tin oxide on borosilicate glass) using iron (III) acetylacetonate (FeAcAc) and titanium diisopropoxide bis(acetylacetonate) (DIPTiAcAc) in methanol. SP was followed by annealing in air from 600 °C to 1000 °C for various durations, and for T ≥ 750 °C, phase pure pseudobrookite was obtained. (Photo)electrochemical experiments of Fe2TiO5 electrodes in junctions with aqueous electrolytes showed n-type behaviour of the material with a maximum photocurrent of 0.35 mA/cm2 under simulated AM1.5 sunlight. A valence band energy between 6.6 and 6.8 eV was estimated using the electrochemical results. The position of the Fe2TiO5 valence band enables the passage of (photogenerated) holes in hematite into a pseudobrookite layer and further on towards an electrolyte, if a hematite/pseudobrookite stratified film would be applied in a solid / liquid junction. The valence band potential is not positive enough for producing OH· radicals, only solvent oxidation and reactions which do not require OH· radicals can proceed.
Trvalý link: https://hdl.handle.net/11104/0339312