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Enhancing the Ionic Conduction of Ceria-Based Electrolytes for LT-SOFCs via Entropy Engineering
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Rare Metals, Volume 45, issue 1, pp. 1-13
Abstract
Developing alternative electrolytes with enhanced ionic conductivity is crucial to reducing the operating temperature of solid oxide fuel cells (SOFCs) for broader applications. Entropy engineering offers many opportunities for material design, presenting a promising avenue to develop new electrolytes. In this work, two new ceria-based electrolytes, the medium-entropy Sm0.25La0.25Pr0.25Ce0.25O2-delta (SLPC25) and low-entropy Sm0.05La0.05Pr0.05Ce0.85O2-delta (SLPC5) are designed for low-temperature SOFCs using the entropy engineering strategy, with pure CeO2 as a reference. It is found that higher configurational entropy leads to enriched oxygen vacancies in the two oxides and thus enhances the ionic transport, which is verified through material characterizations, density functional theory calculations, and cell performance tests. The medium-entropy SLPC25 exhibits superior cell performance (836 mW cm-2) and improved ionic conductivity (0.09 S cm-1) at 520 degrees C as compared to those of the low-entropy SLPC5 and CeO2. Further investigation confirms the hybrid proton-oxygen ion conduction and good fuel cell stability of the SLPC25 electrolyte. This study indicates that higher entropy enhances the ionic conductivity and cell performance of ceria-based electrolytes. The entropy engineering strategy used here holds significant potential to develop advanced electrolytes for low-temperature SOFCs.(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(SOFCs)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)CeO2(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SOFCs(sic)(sic)(sic)(sic)(sic)(sic):(sic)(sic)(sic)(sic)Sm0.25La0.25Pr0.25Ce0.25O2 -delta (SLPC25) (sic)(sic)(sic)(sic)(sic)Sm0.05La0.05Pr0.05Ce0.85O2 -delta (SLPC5).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)520 degrees C(sic)(sic)(sic),(sic)(sic)SLPC25(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)((sic)(sic)(sic)(sic)(sic)(sic)(sic)836 mW cm(-)2)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(0.09 S cm- 1),(sic)(sic)(sic)(sic)(sic)(sic)SLPC5(sic)(sic)CeO2.(sic)(sic)(sic)(sic)(sic)(sic)(sic),SLPC25(sic)(sic)(sic)(sic)(sic)(sic)(sic)-(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SOFCs(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).
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Li, X-X, Hu, E-Y, Wang, F-Z, Wang, J, Xia, C, Staykov, A & Lund, P 2026, 'Enhancing the Ionic Conduction of Ceria-Based Electrolytes for LT-SOFCs via Entropy Engineering', Rare Metals, vol. 45, no. 1, e70034, pp. 1-13. https://doi.org/10.1002/rar2.70034