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Dopaje triple de Fe-Co-Ni en el sitio B para electrodos de oxígeno de alto rendimiento en celdas sólidas reversibles
Bin Li1,2, Hao Xiong1, Guangying Chen3
1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 23, 2026
Resumen
Un nuevo óxido de perovskita, LCFNC, mejora los electrodos de oxígeno para celdas sólidas reversibles (RSOC). Ofrece una actividad, estabilidad y coincidencia de expansión térmica mejoradas, lo que permite aplicaciones RSOC eficientes a escala industrial.
Área de la Ciencia:
- Ciencia de Materiales; Electroquímica; Conversión y Almacenamiento de Energía
Sus antecedentes:
- Los electrodos de oxígeno en las celdas sólidas reversibles (RSOC) enfrentan desafíos que incluyen baja actividad catalítica, pobre estabilidad y desajuste del coeficiente de expansión térmica (TEC) con los electrolitos.; El desarrollo de materiales de electrodos avanzados es crucial para mejorar el rendimiento de las RSOC y permitir aplicaciones prácticas.
Objetivo del estudio:
- Diseñar y sintetizar un novedoso óxido de perovskita, La0.6Ca0.4Fe0.8Ni0.1Co0.1O3-δ (LCFNC), para mejorar el rendimiento del electrodo de oxígeno en RSOC.; Investigar los efectos del dopaje sinérgico en la actividad catalítica, la estabilidad y la compatibilidad térmica de LCFNC.; Evaluar el rendimiento de LCFNC tanto en modo de celda de combustible como de electrólisis, incluidos los dispositivos a escala industrial.
Principales métodos:
- Se empleó una estrategia de dopaje sinérgico multielemental en el sitio B para sintetizar el novedoso óxido de perovskita LCFNC.; Caracterización sistemática de las propiedades estructurales, térmicas y electroquímicas de LCFNC.; Pruebas de rendimiento de celda completa en modo de celda de combustible y electrólisis, incluidas evaluaciones de estabilidad y evaluación de dispositivos a escala industrial.
Principales resultados:
- LCFNC exhibe una TEC suprimida (12,7 × 10-6 K-1 con GDC), asegurando una excelente compatibilidad con el electrolito.; El dopaje sinérgico creó centros activos ternarios, mejorando la concentración de vacantes de oxígeno en la superficie y la actividad catalítica.; Se logró una densidad de potencia máxima de 1,60 W·cm-2 (modo FC) y 1,82 A·cm-2 a 1,3 V (modo electrólisis) a 800°C.; Se demostró una estabilidad excepcional durante 100 h de electrólisis y 24 ciclos reversibles.; Las RSOC de tamaño industrial (15 × 15 cm2) entregaron 64 W (modo FC) y 105 A (modo electrolizador) a 800°C.
Conclusiones:
- El dopaje multielemental en el sitio B es una estrategia eficaz para desarrollar materiales de electrodos de oxígeno de alto rendimiento para RSOC.; LCFNC ofrece una solución prometedora para avanzar en la aplicación práctica de RSOC de alto rendimiento debido a su actividad, estabilidad y compatibilidad mejoradas.; El estudio proporciona una comprensión mecanicista y un principio de diseño para el desarrollo futuro de materiales de electrodos de oxígeno.
Palabras clave:
tamaño industrialelectrodo de oxígenoceldas sólidas reversiblesexpansión térmicatri-dopajeMás Videos Relacionados
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