Schweidler, Simon ; Tang, Yushu ; Lin, Ling ; Karkera, Guruprakash ; Alsawaf, Alaa ; Bernadet, Lucile ; Breitung, Ben ; Hahn, Horst ; Fichtner, Maximilian ; Tarancón, Albert ; Botros, Miriam (2022)
Synthesis of perovskite-type high-entropy oxides as potential candidates for oxygen evolution.
In: Frontiers in Energy Research, 2022, 10
doi: 10.26083/tuprints-00023010
Artikel, Zweitveröffentlichung, Verlagsversion

Kurzbeschreibung (Abstract)

High-entropy materials offer a wide range of possibilities for synthesizing new functional ceramics for different applications. Many synthesis methods have been explored to achieve a single-phase structure incorporating several different elements, yet a comparison between the synthesis methods is crucial to identify the new dimension such complex ceramics bring to material properties. As known for ceramic materials, the synthesis procedure usually has a significant influence on powder morphology, elemental distribution, particle size and powder processability. Properties that need to be tailored according to specific applications. Therefore, in this study perovskite-type high-entropy materials (Gd₀.₂La₀.₂₋ₓ SrₓNd₀.₂Sm₀.₂Y₀.₂) (Co₀.₂Cr₀.₂Fe₀.₂Mn₀.₂Ni₀.₂)O₃ (x = 0 and x = 0.2) are synthesized for the first time using mechanochemical synthesis and a modified Pechini method. The comparison of different syntheses allows, not only tailoring of the constituent elements of high-entropy materials, but also to optimize the synthesis method as needed to overcome limitations of conventional ceramics. To exploit the novel materials for a variety of energy applications, their catalytic activity for oxygen evolution reaction was characterized. This paves the way for their integration into, e.g., regenerative fuel cells and metal air batteries.

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