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MM: Fachverband Metall- und Materialphysik

MM 46: Materials for Energy Storage and Conversion - Electronic Properties

MM 46.1: Vortrag

Mittwoch, 18. März 2020, 17:15–17:30, IFW D

Oxygen Vacancy Formation and Diffusion in Oxide Electrode Materials for High-Temperature Electrolysis — •Hanna Tuerk, Karsten Reuter, and Christoph Scheurer — Technical University of Munich

In a sustainable energy system, the intermittency of green electricity needs to be addressed. One possible solution to stabilize the grid are solid-oxide electrolyzer cells (SOECs), which are able to store excess electric energy into hydrogen on demand [1]. While such high-temperature SOECs are in principle well adapted to intermittent operation with frequent start-ups and shut-downs, cell performance and lifetime of existing SOECs is severely limited by anode degradation [2].

This degradation goes hand in hand with the oxygen evolution reaction (OER) taking place at the triple-phase boundary between the electrode, the electrolyte and the gas phase. In order to shed light on this degradation mechanism, oxygen vacancy formation and defect mobility at the interface of the standard electrolyte yttria-stabilized zirconia (YSZ) and the typical electrode material strontium doped lanthanum manganite (LSM) are investigated theoretically. The structural complexity of the active catalyst region mandates the use of an efficient polarizable force field, which is able to provide insight into the atomistic processes at the higly disordered interface.

[1] S. Foit et al., Angew. Chem. Int. Ed. 56, 5402 (2017).

[2] M. S. Sohal et al., J. Fuel Cell Sci. Tech. 9, 011017 (2012).