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

David Stenzel; Bei Zhou; Chukwudalu Okafor; Mohana Veeraju Kante; Ling Lin; Georgian Melinte; Thomas Bergfeldt; Miriam Botros; Horst Hahn; Ben Breitung; Simon Schweidler

doi:10.3389/fenrg.2022.942314

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

David Stenzel
, Bei Zhou
, Chukwudalu Okafor
, Mohana Veeraju Kante
, Ling Lin
, Georgian Melinte
, Thomas Bergfeldt
, Miriam Botros
, Horst Hahn
, Ben Breitung
, Simon Schweidler

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

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_0.2Fe_0.2Ni_0.2Mg_0.2Zn_0.2)₃O₄ 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 IrO₂, used as reference. The best performance of the synthesized materials was achieved by (Mn_0.2Fe_0.2Ni_0.2Mg_0.2Cr_0.2)₃O₄.

Original language	English
Article number	942314
Journal	Frontiers in Energy Research
Volume	10
DOIs	https://doi.org/10.3389/fenrg.2022.942314
State	Published - Aug 5 2022
Externally published	Yes

Funding

DS, BB, SS, MB, and HH acknowledge the support from EnABLES and EPISTORE, projects funded by the European Union’s Horizon 2020 research and innovation program under grant agreement no. 730957 and 101017709, respectively. HH acknowledges financial support from the Deutsch Forschungsgemeinschaft (DFG) project HA 1344/43-1.

Keywords

catalysis
electrocatalyst
high-entropy materials
high-entropy spinels
nebulized spray pyrolysis
oxygen evolution reaction

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10.3389/fenrg.2022.942314

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title = "High-entropy spinel-structure oxides as oxygen evolution reaction electrocatalyst",

abstract = "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 (Mn0.2Fe0.2Ni0.2Mg0.2Zn0.2)3O4 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 IrO2, used as reference. The best performance of the synthesized materials was achieved by (Mn0.2Fe0.2Ni0.2Mg0.2Cr0.2)3O4.",

keywords = "catalysis, electrocatalyst, high-entropy materials, high-entropy spinels, nebulized spray pyrolysis, oxygen evolution reaction",

author = "David Stenzel and Bei Zhou and Chukwudalu Okafor and Kante, \{Mohana Veeraju\} and Ling Lin and Georgian Melinte and Thomas Bergfeldt and Miriam Botros and Horst Hahn and Ben Breitung and Simon Schweidler",

note = "Publisher Copyright: Copyright {\textcopyright} 2022 Stenzel, Zhou, Okafor, Kante, Lin, Melinte, Bergfeldt, Botros, Hahn, Breitung and Schweidler.",

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day = "5",

doi = "10.3389/fenrg.2022.942314",

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T1 - High-entropy spinel-structure oxides as oxygen evolution reaction electrocatalyst

AU - Stenzel, David

AU - Zhou, Bei

AU - Okafor, Chukwudalu

AU - Kante, Mohana Veeraju

AU - Lin, Ling

AU - Melinte, Georgian

AU - Bergfeldt, Thomas

AU - Botros, Miriam

AU - Hahn, Horst

AU - Breitung, Ben

AU - Schweidler, Simon

PY - 2022/8/5

Y1 - 2022/8/5

N2 - 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 (Mn0.2Fe0.2Ni0.2Mg0.2Zn0.2)3O4 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 IrO2, used as reference. The best performance of the synthesized materials was achieved by (Mn0.2Fe0.2Ni0.2Mg0.2Cr0.2)3O4.

AB - 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 (Mn0.2Fe0.2Ni0.2Mg0.2Zn0.2)3O4 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 IrO2, used as reference. The best performance of the synthesized materials was achieved by (Mn0.2Fe0.2Ni0.2Mg0.2Cr0.2)3O4.

KW - catalysis

KW - electrocatalyst

KW - high-entropy materials

KW - high-entropy spinels

KW - nebulized spray pyrolysis

KW - oxygen evolution reaction

UR - https://www.scopus.com/pages/publications/85136488192

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DO - 10.3389/fenrg.2022.942314

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JO - Frontiers in Energy Research

JF - Frontiers in Energy Research

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ER -

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

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