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Principio de diseño de los electrocatalizadores Fe-N-C: ¿Cómo optimizar las estructuras porosas multimodales?

Soo Hong Lee^1,2, Jiheon Kim^1,2, Dong Young Chung^1,2

¹Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.

Journal of the American Chemical Society

|January 9, 2019

Resumen

Las estructuras porosas jerárquicas en el carbono dopado con nitrógeno mejoran la actividad electrocatalítica para las reacciones de reducción de oxígeno (ORR). Los catalizadores optimizados de hierro-nitrógeno-carbono (Fe-N-C) muestran un rendimiento y una estabilidad superiores en las pilas de combustible.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

Los materiales de carbono dopados con nitrógeno son electrocatalizadores cruciales.
Comprender el papel de las estructuras porosas es clave para optimizar su rendimiento.
La reacción de reducción de oxígeno (ORR) es un proceso crítico en las pilas de combustible.

Objetivo del estudio:

Investigar el impacto de las estructuras porosas en la actividad electrocatalítica del carbono dopado con N.
Para sintetizar y optimizar catalizadores de Fe-N-C para el ORR.
Establecer una estrategia de diseño racional para los electrocatalizadores de carbono porosos.

Principales métodos:

Técnicas de análisis electroquímico.
Síntesis de catalizadores de carbono dopados con N con diferentes estructuras porosas.
Preparación y caracterización de los catalizadores Fe-N-C.
Evaluación del rendimiento en medios ácidos y alcalinos.

Principales resultados:

Las estructuras macro y mesoporosas influyen en diferentes etapas de la cinética de la ORR.
Las estructuras porosas jerárquicas mejoran el rendimiento electrocatalítico tanto en medios ácidos como alcalinos.
Los catalizadores Fe-N-C optimizados demuestran una alta actividad y estabilidad para ORR.

Conclusiones:

El diseño de la estructura porosa es crítico para los electrocatalizadores avanzados.
La porosidad jerárquica ofrece ventajas significativas para ORR.
Los catalizadores Fe-N-C desarrollados representan un avance prometedor para la tecnología de pilas de combustible.

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