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MM: Fachverband Metall- und Materialphysik

MM 30: Functional Materials: Performance, Reliability and Degradation; and Complex Materials (joint session MM/KFM)

MM 30.3: Vortrag

Donnerstag, 20. März 2025, 12:15–12:30, H23

Atomic Scale Insights into A-site Deficient Perovskite Catalysts:La0.7Fe0.7Mn0.3O3 — •Roham Talei Jeid — Institute for Material Physics, University of Stuttgart, Deutschland

This study investigates the atomic-scale properties of the A-site-deficient perovskite catalyst La0.7Fe0.7Mn0.3O3 (La07FM), emphasizing the role of iron oxide (FeO) in redox reactions. Advanced techniques, including scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDXS), and a custom Python-based strain mapping tool linked to chemical analysis reveal nanoscale La deficiencies and Fe enrichments at grain boundaries as key for catalytic activity. Post-catalysis studies identify Fe-rich, FeO-like nanoparticles at strained, defective grain boundaries, underscoring the impact of A-site deficiencies on performance in NOx denitrification (DeNOx). These findings highlight how A-site deficiencies and Fe-rich nanostructures enhance catalytic efficiency, offering broader insights into electrochemistry and heterogeneous catalysis.

Keywords: A-site deficient perovskite; STEM; EDXS; DeNOx reaction; sustainable catalysis