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La diversidad del sitio de unión promueve la electrorreducción al etanol

Yuguang C Li1, Ziyun Wang1, Tiange Yuan2

  • 1Department of Electrical and Computer Engineering , University of Toronto , 35 St. George Street , Toronto , Ontario M5S 1A4 , Canada.

Journal of the American Chemical Society
|May 10, 2019
PubMed
Resumen

Los investigadores han desarrollado un nuevo catalizador de plata-cobre (Ag/Cu) para la reducción electroquímica del dióxido de carbono (CO2). Este catalizador aumenta significativamente la selectividad de la producción de etanol, logrando una eficiencia récord para este valioso producto químico.

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Área de la Ciencia:

  • La electroquímica
  • Catálisis
  • Ciencias de los materiales

Sus antecedentes:

  • La reducción electroquímica del dióxido de carbono (CO2) es crucial para la producción de productos químicos valiosos.
  • Los catalizadores actuales a menudo favorecen el etileno sobre el etanol, lo que limita la viabilidad industrial del etanol.
  • El desarrollo de catalizadores selectivos para la producción de etanol sigue siendo un desafío importante.

Objetivo del estudio:

  • Mejorar la selectividad del etanol en la electrorreducción de CO2.
  • Diseñar un catalizador que promueva la formación de etanol sobre el etileno.
  • Establecer un marco para el diseño de catalizadores multimetales para la reducción de CO2.

Principales métodos:

  • Desarrollo de un catalizador bimetálico de plata y cobre (Ag/Cu).
  • Utilizando diversos sitios de unión en la superficie del catalizador.
  • Espectroscopia Raman in situ para analizar el comportamiento del catalizador.
  • Pruebas electroquímicas a 250 mA/cm2 y -0,67 V frente a las RHE.

Principales resultados:

  • Logró una eficiencia Faradaic récord del 41% para la producción de etanol.
  • Demostró una eficiencia energética catódica del 24,7%.
  • Se observó un espectro ampliado de Raman in situ que indica diversas configuraciones de unión.

Conclusiones:

  • Diversos sitios de unión en los catalizadores Ag/Cu desestabilizan los intermedios de etileno, promoviendo la producción de etanol.
  • El diseño del catalizador bimetálico ofrece una ruta prometedora para la síntesis de etanol altamente selectiva.
  • La unión de múltiples sitios proporciona un marco para el diseño de catalizadores avanzados para la electrorreducción de CO2.