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High-entropy spinel-structure oxides as oxygen evolution reaction electrocatalyst

Stenzel, David 1; Zhou, Bei 1; Okafor, Chukwudalu; Kante, Mohana Veeraju 1; Lin, Ling 1; Melinte, Georgian 1; Bergfeldt, Thomas ORCID iD icon 2; Botros, Miriam 1; Hahn, Horst 1; Breitung, Ben ORCID iD icon 1; Schweidler, Simon ORCID iD icon 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)


High-entropy oxides are an upcoming research topic due to their broad range of possible crystal structures and applications. In this work, we want to present the change in the catalytic properties when using different elements to create a high-entropy spinel. Therefore, we used the nebulized-spray pyrolysis to synthesize the high-entropy spinel (Mn$_{0.2}$Fe$_{0.2}$Ni$_{0.2}$Mg$_{0.2}$Zn$_{0.2}$)$_{3}$O$_{4}$ and later on exchanged the Mg or the Zn with elements with multiple possible oxidation states, in our example each with Cr or Co. The phase purity, morphology, microstructure and homogeneity were investigated by XRD, SEM and STEM-EDX. Their electrocatalytic performance and stability was measured via oxygen evolution reaction and cyclic voltammetry and compared to IrO$_{2}$, used as reference. The best performance of the synthesized materials was achieved by (Mn$_{0.2}$Fe$_{0.2}$Ni$_{0.2}$Mg$_{0.2}$Cr$_{0.2}$)$_{3}$O$_{4}$.

Verlagsausgabe §
DOI: 10.5445/IR/1000150547
Veröffentlicht am 14.09.2022
DOI: 10.3389/fenrg.2022.942314
Zitationen: 3
Web of Science
Zitationen: 2
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2296-598X
KITopen-ID: 1000150547
HGF-Programm 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Weitere HGF-Programme 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Frontiers in Energy Research
Verlag Frontiers Media SA
Band 10
Seiten Art.-Nr.: 942314
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 05.08.2022
Schlagwörter 2015-013-006397 TEM
Nachgewiesen in Dimensions
Web of Science
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