Issue 37, 2024

A novel strategy of entropy engineering at the A-site in spinel oxides for developing high-performance SOFC cathodes

Abstract

Developing high-performance cathode materials for intermediate-temperature solid oxide fuel cells (SOFCs) is crucial to advance SOFC technology. This study explores the application of an entropy engineering strategy to the A-site of ferrite spinel oxides to develop high-performance cathode materials. We synthesized a high-entropy spinel oxide, (Mg0.2Fe0.2Co0.2Ni0.2Cu0.2)Fe2O4, and compared its performance with its lower-entropy counterparts, CoFe2O4 and (Mg0.333Co0.333Ni0.333)Fe2O4. Experimental results and density functional theory (DFT) calculations revealed that (Mg0.2Fe0.2Co0.2Ni0.2Cu0.2)Fe2O4 exhibits superior electrochemical performance owing to its suitable electronic structure, diverse surface metal cations, and abundant surface oxygen vacancies. When applied as the cathode in an anode-supported SOFC, the cell achieves a peak power density of 787.15 mW cm−2 at 800 °C and demonstrates excellent long-term stability over 100 hours of operation. These findings highlight the potential of A-site entropy engineering as a promising approach to enhance the performance and stability of SOFC spinel oxide cathodes.

Graphical abstract: A novel strategy of entropy engineering at the A-site in spinel oxides for developing high-performance SOFC cathodes

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Article information

Article type
Paper
Submitted
16 júl 2024
Accepted
29 aug 2024
First published
30 aug 2024

J. Mater. Chem. A, 2024,12, 24997-25010

A novel strategy of entropy engineering at the A-site in spinel oxides for developing high-performance SOFC cathodes

Z. Chen, B. Ma, C. Dang, J. Che, L. Cheng and Y. Zhou, J. Mater. Chem. A, 2024, 12, 24997 DOI: 10.1039/D4TA04925J

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