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La ingeniería de facetas y el diseño de poros impulsan el intercambio dinámico de hierro en la catálisis de la

Yong Wang¹, Yongzhi Zhao^1,2, Luan Liu¹

¹Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

Journal of the American Chemical Society

|July 15, 2023

Resumen

Diseñamos un nuevo catalizador basado en cobalto que mejora la cinética de la reacción de evolución del oxígeno (OER). Este diseño de catalizador mejora la eficiencia y la estabilidad en aplicaciones de energía renovable como pilas de combustible y baterías.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

La reacción de evolución del oxígeno (OER) es crucial para las tecnologías de energía renovable, pero está limitada por la cinética lenta.
Los catalizadores existentes muestran a menudo un rendimiento insatisfactorio debido a la lentitud de los procesos OER.

Objetivo del estudio:

Desarrollar un catalizador altamente eficiente y estable para la reacción de evolución del oxígeno (OER).
Regular el mecanismo de intercambio dinámico de los sitios activos de Fe utilizando la ingeniería del plano cristalino y el diseño de la estructura de poros.

Principales métodos:

Hidróxido de cobalto diseñado con nanoagujeros de alta densidad para albergar especies de Fe.
Utilizó la ingeniería del plano cristalino y el diseño de la estructura de poros para controlar la adsorción y la difusión de Fe.
Se empleó espectrometría de masas etiquetada con isótopos Fe57 para demostrar el equilibrio dinámico de Fe.

Principales resultados:

Logró un bajo sobrepotencial OER de 228 mV a 10 mA cm-2, superando a muchos catalizadores basados en cobalto.
Demostró una estabilidad catalítica significativamente mejorada, reduciendo la lixiviación de Fe en dos órdenes de magnitud.
Demostró una estabilidad a largo plazo de 130 h para el catalizador y 170 h para una batería de Zn-aire ensamblada.

Conclusiones:

El catalizador diseñado exhibe una alta actividad y estabilidad OER debido a la dinámica controlada del Fe dentro de los nanoagujeros.
Esta estrategia ofrece un enfoque prometedor para el desarrollo de catalizadores avanzados para aplicaciones de energía renovable.
El rendimiento del catalizador en las baterías de Zn-aire destaca su potencial práctico.

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