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Cadros metálicos orgánicos para la reducción electrocatalítica del dióxido de carbono

Nikolay Kornienko, Yingbo Zhao, Christopher S Kley

¹King Abdulaziz City of Science and Technology , P.O. Box 6086, Riyadh 11413, Saudi Arabia.

Journal of the American Chemical Society

|October 29, 2015

Resumen

Desarrollamos marcos metálico-orgánicos (MOF) de tamaño nanométrico como catalizadores para la reducción electroquímica de dióxido de carbono. Estos MOF convierten eficientemente el CO2 en CO con alta selectividad y estabilidad, utilizando elementos abundantes en la tierra.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

La reducción electroquímica de dióxido de carbono enfrenta desafíos en el diseño del catalizador para la selectividad, la estabilidad y la composición abundante en tierra.
El desarrollo de catalizadores eficientes es crucial para la utilización sostenible del carbono.

Objetivo del estudio:

Introducir y evaluar los marcos metálico-orgánicos (MOF) de tamaño nanométrico como catalizadores para la reducción electroquímica de CO2.
Investigar el rendimiento de un MOF de cobalto-porfirina para la producción selectiva de CO.

Principales métodos:

Fabricación de películas finas de MOF de tamaño nanométrico.
Caracterización electroquímica de la reducción de CO2 en electrolitos acuosos.
Mediciones espectroelectroquímicas in situ para sondear los mecanismos de reacción.

Principales resultados:

Un MOF de cobalto-porfirina (Al2(OH) 2TCPP-Co) demostró una alta selectividad (> 76%) para la producción de CO.
El catalizador mostró estabilidad durante 7 horas con un número de volúmenes (TON) de 1400.
Los estudios in situ revelaron la accesibilidad redox de los centros de cobalto (de Co (II) a Co (I)) durante la catálisis.

Conclusiones:

Los MOF nano son catalizadores eficaces y definidos atómicamente para la reducción electroquímica de CO2.
Los MOF de cobalto-porfirina ofrecen una vía prometedora para la conversión eficiente y selectiva de CO2 a CO.
Comprender el comportamiento redox de los centros catalíticos es clave para optimizar el rendimiento de MOF.

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