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Hidróxidos de NiFe dopados con cerio que permiten vías híbridas para la oxidación duradera del agua alcalina bajo

Suwen Wang¹, Binbin Lin¹, Menghui Qi¹

¹Advanced Materials and Catalysis Group, Zhejiang Key Laboratory of Low-Carbon Synthesis of Value-Added Chemicals, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China.

|August 28, 2025

Resumen

Desarrollamos un catalizador de doble hidróxido de níquel-hierro sustituido por cerio (NiFe-Ce LDH) que produce eficientemente hidrógeno a través de la oxidación del agua. Este material avanzado funciona de manera estable bajo condiciones energéticas fluctuantes, lo que es prometedor para soluciones energéticas sostenibles.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

La oxidación eficiente del agua es crucial para la producción sostenible de hidrógeno.
Los hidróxidos dobles en capas de níquel y hierro (NiFe-LDH) son electrocatalizadores prometedores, pero requieren una mayor optimización.
Comprender los mecanismos de reacción es clave para diseñar catalizadores mejorados.

Objetivo del estudio:

Desarrollar un nuevo catalizador NiFe-LDH (NiFe-Ce LDH) sustituido por cerio.
Investigar la activación sinérgica del mecanismo de evolución del adsorbado (AEM) y el mecanismo de celosía-oxígeno localizado (LOM).
Evaluar el rendimiento y la estabilidad del catalizador para la oxidación del agua alcalina.

Principales métodos:

Síntesis de NiFe-LDH sustituido por cerio.
Espectroscopia de absorción de infrarrojos con reflexión total atenuada en la superficie (ATR-SEIRAS).
Espectrometría de masas electroquímica diferencial (DEMS).
Pruebas electroquímicas en medios alcalinos y en ensambladores de electrodos de membrana (MEA).

Principales resultados:

El NiFe-Ce LDH activa sinérgicamente tanto el AEM como el LOM a través de las interacciones Ce 4f-O 2p.
La incorporación atómica de Ce estabiliza los sitios de Fe y permite la redox de oxígeno en celosía controlada.
Se ha confirmado la formación simultánea de productos intermedios *OOH y OO*, lo que indica una vía híbrida.
El catalizador optimizado logra un sobrepotencial de 220 mV a 10 mA cm2 y 500 mA cm2 durante 650 h.
El electrolizador MEA demuestra un funcionamiento estable de 20 A durante más de 800 h con un aumento mínimo de voltaje.
El catalizador muestra un rendimiento estable bajo las fluctuaciones de tensión simuladas de la energía eólica.

Conclusiones:

El NiFe-Ce LDH es un electrocatalisador altamente eficiente y estable para la oxidación del agua alcalina.
La vía híbrida AEM-LOM activada por la sustitución de Ce es eficaz para mejorar la actividad catalítica.
El catalizador demuestra un potencial significativo para la producción sostenible de hidrógeno en entornos dinámicos de energía renovable.

Palabras clave:

El AEMWE Recorrido LOM Dispersión atómica de Ce auto-reconstrucción dinámica Redistribución de electrones

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