Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry
O 45.18: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Electrochemical Surface Science of Magnetite Fe3O4 under Oxygen Evolution Conditions — •Matthias Müllner, Michele Riva, Giada Franceschi, Gareth Parkinson, Ulrike Diebold, and Stijn F.L. Mertens — TU Wien, Institut für Angewandte Physik, Wiedner Hauptstrasse 8-10/134, 1040 Vienna
Earth-abundant oxides such as magnetite Fe3O4, with the addition of dopants, are promising candidates for an effective but low-cost catalyst for the oxygen evolution reaction (OER), which is one of the remaining bottlenecks in electrolysis and artificial photosynthesis.
We report electrochemical surface science studies on well-defined magnetite single-crystal surfaces, with the aim of linking reactivity to atomic-level structural information. Preparation and characterisation in UHV (STM, LEED, XPS) are followed by transfer to the electrochemical environment (open-circuit potential measurements, cyclic voltammetry, impedance), using a new sessile-drop cell design. Post-measurement characterisation of the surface in UHV and by ambient AFM indicates stability of Fe3O4(001) towards electrolyte exposure (pH 7 up to 14) and during OER. Ongoing work aims to reveal the effects of surface orientation, whether transition-metal-doping of the surface is feasible and how this affects electrocatalytic activity.