Berlin 2024 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 1: Thin Oxides and Oxide Layers (joint session DS/KFM)

DS 1.7: Vortrag

Montag, 18. März 2024, 11:15–11:30, A 053

Engineering electrochemical conversion in La₂NiMnO₆ using magnetic ground states — •Pia Henning and Jasnamol Palakkal — Institute of Materials Physics, Georg-August-University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

For a more sustainable future, the identification of new electrocatalyst materials for the oxygen evolution reaction (OER) plays an important role. In the course of this, the oxide double perovskite La₂NiMnO₆ exhibits a promising role [1]. Especially interesting for this material is the interplay between magnetic ground state and OER activity. The catalytic activity of La₂NiMnO₆ powder samples is enhanced when a vibronic superexchange interaction is present, dominating over static exchange interactions [1]. However, the magnetic structure is closely linked to the oxygen content in the sample and a low Curie temperature can also be originating from oxygen vacancies in the lattice [2]. To resolve this, we prepared La₂NiMnO₆ thin films with our hybrid PLD set-up, combining standard PLD with MBE techniques. The samples were carefully modified by controlling the oxygen content. These modifications of the B-site electronic configuration were then related to the OER activities of the samples, using the magnetic properties as descriptor.

[1] Y. Tong, J. Wu, P. Chen, H. Liu, W. Chu, C. Wu, Y. Xie, Journal of the American Chemical Society 2018, 140(36), 11165.

[2] J. P. Palakkal, T. Schneider, L. Alff, AIP Advances 2022, 12(3), 035116.

Keywords: Oxide Perovskites; Oxygen Evolution Reaction; Magnetism; Pulsed laser deposition