Iron oxide films elaboration by ACG at SPEC/LNO.
Left: FeCl3 solutions (pH = 1.0, 1.2, 1.4). Right: phase transition by air annealing between the akaganeite (left) and hematite (right)
The aqueous chemical growth (ACG)  allows growing well-organized nanostructured oxide films with thicknesses from tens to several hundreds of nanometers. For hematite deposition the substrates (e.g. FTO on glass substrates) are dipped in aqueous FeCl3 acidic solution contained in closed bottles. The hydrothermal growth activation is achieved at temperatures lower than 100°C, the substrate being covered by an iron oxy-hydroxide film, the akaganeite phase. Film morphology, thickness, crystallographic and electronic structures, chemical composition are strongly dependent of deposition parameters: solution pH, deposition time, oven temperature, substrate cleaning, etc. Phase transition to hematite (α – Fe2O3) phase is obtained by air annealing at 500 – 600°C.
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Victoria Villard, internship M1: Physique et Applications, UPMC: “Synthèse des photo-anodes en solution aqueuse”, CEA – Saclay / DRF / IRAMIS / SPEC - CNRS UMR 3680 / LNO, 2017
Mekan Piriyev, M2: International Master Degree student in SERP+, Paris Saclay University: “Towards understanding the origin of the hematite photoanode optimization via Ti-doping for solar water splitting”, Synchrotron SOLEIL – CEA Saclay/DRF/IRAMIS/SPEC/LNO, 2019
Sara Mahfouf, M2: Master Inorganic Chemistry, Paris Saclay University: “Graphite electrodes patterning decorated with hematite nanorods for solar water splitting liquid microcell fabrication”, Synchrotron SOLEIL – CEA Saclay/DRF/IRAMIS/SPEC/LNO, 2020
Characterizing surface states in hematite nanorod photoanodes, both beneficial and detrimental to solar water splitting efficiency,
D. Stanescu, M. Piriyev, V. Villard, C. Mocuta, A. Besson, D. Ihiawakrim, O. Ersen, J. Leroy, S. G. Chiuzbaian, A. P. Hitchcock, S. Stanescu,
J. Mater. Chem. A, 2020, 8, 20513-20530,