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La supresión de la segregación Sr en La_0.6 Sr_0.4 Co_0.2 Fe_0.8 O_3-δ Electrodo de oxígeno a través del dopaje de Ca para

Jianzhi Yu¹, Xucong Liu¹, Mengjin Zhong¹

¹School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

ACS applied materials & interfaces

|February 11, 2026

Resumen

El dopaje de calcio mejora la estabilidad de las células de óxido sólido reversibles (RSOC) al prevenir la segregación de estroncio en los electrodos La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ (LSCF-GDC). Esto mejora el rendimiento tanto en las celdas de combustible de óxido sólido (SOFC) como en las celdas de electrólisis de óxido sólido (SOEC).

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La electroquímica es electroquímica.
Almacenamiento de energía Almacenamiento de energía

Sus antecedentes:

Las células reversibles de óxido sólido (RSOC) ofrecen una doble funcionalidad para la generación de electricidad e hidrógeno.
La segregación de estroncio (Sr) en electrodos de oxígeno La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ (LSCF-GDC) degrada el rendimiento a altas densidades de corriente.
Esta degradación está relacionada con la reducción de la actividad catalítica y la baja estabilidad en los RSOC.

Objetivo del estudio:

Investigar el efecto del dopaje de calcio (Ca) en la supresión de la segregación de Sr en electrodos de oxígeno basados en LSCF.
Mejorar la estabilidad operativa a largo plazo de los RSOC bajo altas densidades de corriente.
Para evaluar el rendimiento de los electrodos dopados con Ca en los modos de célula de combustible de óxido sólido (SOFC) y célula de electrólisis de óxido sólido (SOEC).

Principales métodos:

Síntesis de electrodos compuestos LSCF-GDC con dopaje de Ca (La_0.6Sr_0.2Ca_0.2Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ, LSCCF-GDC).Se ha desarrollado también una serie de electrodos compuestos LSCF-GDC con dopaje de Ca (La_0.6Sr_0.2Ca_0.2Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ, LSCCF-GDC).
Caracterización de los mecanismos de supresión de la segregación de Sr, incluidas las fuerzas motrices elásticas y electrostáticas.
Pruebas de rendimiento a largo plazo de RSOC con LSCCF-GDC y electrodos LSCF-GDC tradicionales a 750 °C y 1,2 A·cm−2.

Principales resultados:

El dopaje de Ca suprimió efectivamente la segregación de Sr en el electrodo de oxígeno basado en LSCF.
El electrodo LSCCF-GDC dopado con Ca exhibió una estabilidad significativamente mejorada durante el funcionamiento a largo plazo.
A 1,2 A·cm^-2, las tasas de degradación fueron de 10 mV/100h (SOFC) y 17 mV/100h (SOEC) para LSCCF-GDC, en comparación con 18 mV/100h (SOFC) y 82 mV/100h (SOEC) para LSCF-GDC.

Conclusiones:

El dopaje de Ca es una estrategia viable para mitigar la segregación de Sr y mejorar la estabilidad de RSOC.
El electrodo LSCCF-GDC demuestra un rendimiento superior y durabilidad para aplicaciones de alta densidad de corriente.
Este trabajo proporciona una vía para desarrollar electrodos de oxígeno más robustos para sistemas avanzados de conversión de energía.

Palabras clave:

Fue por dopaje.Sr segregación Sr segregación.El electrodo de oxígeno es un electrodo de oxígeno.estabilidad de la estabilidad del rendimiento.células reversibles de óxido sólido de células reversibles.

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