Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Energy materials (other than photovoltaics)

HL 53.3: Vortrag

Freitag, 16. März 2018, 10:00–10:15, EW 202

Structure function correlation of Co2Mn1−xFexO4 regarding the OER — •Maike Uptmoor and Kathrin M. Lange — Bielefeld University, Germany

A promising approach for a clean energy future is to store solar energy in a chemical fuel like hydrogen by photoelectrochemical (PEC) water splitting. Because the production of oxygen at the anode is sluggish compared to the one of hydrogen it is of high relevance to develop new catalytic materials to accelerate the oxygen evolution reaction (OER) thus enhance the overall efficiency of this process. First row transition metal oxide catalysts are very promising candidates because they are abundant have low costs and are stable in several oxidation states.

Thin films of the transition metals oxides Co2Mn1−xFexO4 are investigated in detail. They are synthesized by co-sputtering and subsequently post annealed to obtain a crystalline structure. Several measurements are performed to correlate the structure to the catalytic activity. The crystal structure and morphology are analyzed in detail by X-ray-diffraction (XRD) and secondary electron microscopy (SEM). Electrochemical methods are performed in a three electrode configuration with an alkaline electrolyte while the metal oxides sputtered on gold layers act as working electrode in the electrochemical-setup. Different methods are performed to measure the activity and the stability of the sample, among others cyclic voltammetry and chronopotentiometry. First results of the structure characterization and electrochemical measurements of the material will be presented.

Schwanke, C., et al. (2017). Sci Rep 7: 44192.

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