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Sitios diseñados en redes de nanofibra de carbono para la reducción de oxígeno de AEMFC

Chao Ge¹, Yunlan Gu¹, Bin He²

¹School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng 224007, China.

Langmuir : the ACS journal of surfaces and colloids

|February 10, 2026

Resumen

El desarrollo de catalizadores libres de metales del grupo del platino (PGM) y libres de hierro es crucial para las reacciones de reducción de oxígeno (ORR) en células de combustible de membrana de intercambio aniónico (AEMFC). Los nuevos MnN4@N-CNF muestran una alta actividad y durabilidad para una electrocatálisis ORR eficiente.

Área de la Ciencia:

La electroquímica es electroquímica.
Ciencia de los materiales Ciencia de los materiales.
La catálisis es la catálisis.

Sus antecedentes:

La reacción de reducción de oxígeno (ORR) está cinéticamente limitada en las células de combustible de membrana de intercambio de aniones (AEMFC).
Se necesitan catalizadores libres de platino y metales del grupo (PGM) y libres de hierro para ORR, especialmente para conjuntos de electrodos de membrana (MEAs).
Lograr una alta actividad y estabilidad en condiciones operativas sigue siendo un desafío.

Objetivo del estudio:

Diseñar y sintetizar un catalizador eficaz sin PGM y sin hierro para la electrocatálisis ORR.
Investigar el rendimiento catalítico y la durabilidad del nuevo catalizador en AEMFCs.
Establecer principios de diseño para electrocatalizadores avanzados.

Principales métodos:

Síntesis de sitios activos de MnN4 dentro de nanofibras de carbono dopadas con nitrógeno (MnN4@N-CNFs).
Caracterización de la estructura del catalizador, las propiedades electrónicas y el acoplamiento interfacial.
Pruebas electroquímicas en medios alcalinos y funcionamiento del dispositivo AEMFC.

Principales resultados:

MnN4@N-CNFs exhibió un alto potencial de media onda de 0,89 V para ORR.
El catalizador demostró una excepcional durabilidad y tolerancia al metanol.
Logró una densidad de potencia máxima de 222,0 mW cm-2 en AEMFC, superando el rendimiento comercial de Pt/C.
Mantuvo un funcionamiento estable durante más de 15 horas.

Conclusiones:

La ingeniería a nivel atómico de MnN4@N-CNFs proporciona un marco sólido para una electrocatálisis ORR eficiente.
El catalizador desarrollado ofrece una alternativa prometedora a los catalizadores basados en PGM para AEMFC.
Destaca el potencial de sitios activos de metal-N-C coordinados con precisión para las pilas de combustible de próxima generación.

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