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Electrocatalizadores de evolución de oxígeno de cobalto-hierro (óxido) hidróxido: el papel de la estructura y la

Michaela S Burke¹, Matthew G Kast¹, Lena Trotochaud¹

¹†Department of Chemistry and Biochemistry and ‡Center for Sustainable Materials Chemistry, University of Oregon Eugene, Oregon 97403, United States.

Journal of the American Chemical Society

|February 21, 2015

Resumen

La adición de hierro (Fe) al oxihidróxido de cobalto (CoOOH) aumenta significativamente la actividad del electrocatalizador de la reacción de evolución del oxígeno (OER). El hierro actúa como el sitio activo, mientras que el oxihidróxido de cobalto proporciona estabilidad y conductividad.

Área de la Ciencia:

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

Sus antecedentes:

Los óxidos y (oxihidróxidos) de cobalto son electrocatalizadores clave para la reacción de evolución del oxígeno (OER).
La adición de hierro (Fe) mejora la actividad de OER en materiales relacionados a base de níquel, pero su papel en los sistemas de cobalto es menos comprendido.
Las impurezas de electrolitos pueden introducir Fe en el oxihidróxido de cobalto libre de Fe (CoOOH), lo que afecta sus propiedades.

Objetivo del estudio:

Investigar el efecto del dopaje de Fe en la actividad de la OER y las propiedades del oxihidróxido de cobalto (Co(1-x) Fe(x) ((OOH)).
Para aclarar el papel de Fe y Co en el mecanismo electrocatalítico y la estabilidad del material.

Principales métodos:

Síntesis y caracterización de Co{1-x) Fe{x) {OOH) con contenido variable de Fe (x).
Mediciones de conductividad eléctrica in situ bajo condiciones OER.
Pruebas de actividad electroquímica (OER) y estudios de estabilidad.
Mediciones de microbalance para evaluar la disolución de la película.

Principales resultados:

La actividad intrínseca OER aumentó ~100 veces con Fe dopado (x ≈ 0.6-0.7) en comparación con Fe-libre CoOOH.
La incorporación de Fe condujo a dopaje sustitutivo e interacciones electrónicas fuertes, evidenciadas por un cambio en la onda redox de Co.
La conductividad de Co{1-x) Fe{x) {OOH) bajo condiciones OER fue significativamente mayor que la de FeOOH.
Las películas ricas en Fe (x ≥ 0.54) mostraron disolución, mientras que las películas pobres en Fe mostraron una disminución de la actividad con el tiempo debido a la conversión de fase.

Conclusiones:

El Fe es el sitio activo primario para el OER en los catalizadores Co{1-x}Fe{x}OOH.
CoOOH actúa como un huésped conductor y estabilizador para los sitios activos de Fe.
El dopaje optimizado de Fe mejora el rendimiento de OER, pero la estabilidad necesita ser considerada para aplicaciones prácticas.

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