9:30 AM - ST04.01.07
Late News: High-Entropy Ceramics for Electrochemical Applications
Ben Breitung1,Qingsong Wang1,Miriam Botros1,Simon Schweidler1,Abhishek Sarkar2,Yanjiao Ma1,Torsten Brezesinski1,Horst Hahn1,2
Karlsruhe Institute of Technology1,KIT-TUD Joint Research Laboratory Nanomaterials Institute of Materials Science, Technische Universität Darmstadt2
In recent years, the transition from high-entropy alloys to high-entropy ceramics (e.g. high-entropy oxides, oxyfluorides, fluorides, etc.) has paved the way for a completely new field of materials and applications. The strong structure/property relationships and the unique possibility to tailor the compositions of high-entropy materials make them ideal candidates when aiming to prepare novel materials with adjustable properties for a variety of different applications.
Here, the utilization of several different high-entropy ceramics in the electrochemical sector will be presented. Conversion battery anodes and cathodes could be prepared using high-entropy oxides and fluorides, offering unexpected properties and advantages compared to conventional materials, which make them interesting for further research. It could be shown that the high entropy plays a decisive role regarding the performance of the electrodes and serves as an “adjusting screw” when the material is tailored towards a desired property. High-entropy insertion and intercalation materials could also be synthesized by introducing high-entropy oxyfluorides and layered high-entropy structures, respectively.[3,4] Moreover, high-entropy oxides and high-entropy metal organic frameworks were applied to design post-Li battery electrodes for Na insertion. These materials do stand out due to their high reversibility and high accessible C-rates over reversible de/sodiation. Finally, the utilization of high-entropy molybdates and fluorides as catalysts for oxygen evolution reactions will shortly be demonstrated.
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