Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 13: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 3
MM 13.3: Vortrag
Dienstag, 6. September 2022, 11:15–11:30, H45
Magnetic Field-assisted Chemical Vapor Deposition of MgFe2O4 Films for Photoelectrochemical Water Splitting — Hyenkwon Lee1, •Ziyaad Talha Aytuna1, Aman Bhadrwaj1, Michael Wilhelm1, Khan Le1, Benjamin May2, David Müller2, and Sanjay Mathur1 — 1Greinstraße 6, 50939 Köln — 2Wilhelm-Johnen-Straße, 52438 Jülich
Single-phase magnesium ferrite films (MgFe2O4) were grown by magnetic field-assisted chemical vapor deposition (CVD) of mixed-metal precursor [MgFe2(OtBu)8] as a function of the applied field strength (B = 0.0, 0.5 and 1.0 T). The formation of monophase MgFe2O4 deposits was confirmed by X-ray diffraction and photoelectron spectroscopy. The cross-sectional analysis (FIB-SEM) of the film revealed an increased densification and crystal growth, upon application of the magnetic field when compared to zero-field deposition. The MgFe2O4 films deposited under zero-field and field-assisted conditions were used as electrodes in a photoelectrochemical (PEC) water-splitting reaction. All the three samples showed a stable performance and photocurrent values, however, the photocurrent was found to gradually decrease with increasing applied magnetic field (0 T: 5.74 μA/cm2, 0.5 T 2.33 μA/cm2, and 1 T: 1.33 μA/cm2 at 1.23 V (vs. RHE)), which is possibly due to change in absorption properties and crystal orientation, decreasing photo absorption intensity provided by the UV-vis results and the latter being evident in the disappearance of (220) peak in MgFe2O4 films grown under the influence of the external magnetic field.