title: TiO2 and Fe2O3 films for photoelectrochemical water splitting.
abstract: Titanium oxide (TiO2) and iron oxide (α-Fe2O3) hematite films have potential applications as photoanodes in electrochemical water splitting. In the present work TiO2 and α-Fe2O3 thin films were prepared by two methods, e.g., sol-gel and High Power Impulse Magnetron Sputtering (HiPIMS) and judged on the basis of physical properties such as crystalline structure and surface topography and functional properties such as simulated photoelectrochemical (PEC) water splitting conditions. It was revealed that the HiPIMS method already provides crystalline structures of anatase TiO2 and hematite Fe2O3 during the deposition, whereas to finalize the sol-gel route the as-deposited films must always be annealed to obtain the crystalline phase. Regarding the PEC activity, both TiO2 films show similar photocurrent density, but only when illuminated by UV light. A different situation was observed for hematite films where plasmatic films showed a tenfold enhancement of the stable photocurrent density over the sol-gel hematite films for both UV and visible irradiation. The superior properties of plasmatic film could be explained by ability to address some of the hematite drawbacks by deposition of very thin films (25 nm) consisting of small densely packed particles and by doping with Sn.
authors.affiliation: Department of Inorganic Technology, University of Chemistry and Technology, Prague, Technická 5, Prague 16628, Czech Republic. krysaj@vscht.cz.
authors.forename: Josef
authors.initials: J
authors.lastname: Krysa
authors.affiliation: Department of Inorganic Technology, University of Chemistry and Technology, Prague, Technická 5, Prague 16628, Czech Republic. zlamalm@vscht.cz.
authors.forename: Martin
authors.initials: M
authors.lastname: Zlamal
authors.affiliation: Joint Laboratory of Optics, Palacky University, RCPTM, 17. listopadu 12, Olomouc 77146, Czech Republic. kment@fzu.cz.
authors.forename: Stepan
authors.initials: S
authors.lastname: Kment
authors.affiliation: Department of Inorganic Technology, University of Chemistry and Technology, Prague, Technická 5, Prague 16628, Czech Republic. brunclim@vscht.cz.
authors.forename: Michaela
authors.initials: M
authors.lastname: Brunclikova
authors.affiliation: Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 14800, Czech Republic. hubicka@fzu.cz.
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Hubicka
mesh_terms: D004560:Electricity; D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010777:Photochemistry; D013059:Spectrum Analysis, Raman; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D014867:Water; C009495:titanium dioxide; C000499:ferric oxide; D014025:Titanium