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Competencia entre la reducción de CO2 y la evolución del hidrógeno en un electrodo de oro en condiciones de

Akansha Goyal¹, Giulia Marcandalli¹, Vladislav A Mints¹

¹Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.

Journal of the American Chemical Society

|February 12, 2020

Resumen

El transporte masivo mejorado mejora el oro

Área de la Ciencia:

La electroquímica
Catálisis
Ciencias de la superficie

Sus antecedentes:

El oro (Au) es un catalizador selectivo para la reducción electroquímica de dióxido de carbono (CO2RR) a monóxido de carbono (CO).
La reacción de evolución del hidrógeno (HER) es una reacción en competencia que reduce la selectividad de la CO2RR en condiciones acuosas.

Objetivo del estudio:

Investigar cuantitativamente el papel del transporte masivo en la competencia entre CO2RR y HER en las superficies de Au.
Comprender cómo el transporte de masas influye en la selectividad en la reducción electroquímica de CO2.

Principales métodos:

Se utilizó una configuración de electrodo de disco de anillo giratorio (RRDE).
Estudió la superficie de Au en un electrolito de bicarbonato de 0,1 M.
Analizó la competencia entre CO2RR y HER en diferentes condiciones de transporte masivo.

Principales resultados:

La selectividad de CO2RR aumentó del 67% al 83% con el transporte masivo mejorado.
El aumento del transporte de masa inhibió el HER competidor, no aumentando la tasa de CO2RR.
La disminución de la alcalinidad local cerca de la superficie del electrodo suprimió el HER.

Conclusiones:

Las condiciones de transporte masivo se pueden utilizar para ajustar el pH local y controlar el HER.
Esta modulación del pH regula efectivamente la competencia entre CO2RR y HER en los catalizadores de oro.
La optimización del transporte de masas es crucial para mejorar la selectividad del CO2RR en electrolitos acuosos.

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