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Peculiaridad catalítica de las interfaces de electrodo/polielectrolito sin catión de metal alcalino hacia la

Zhensheng Mi¹, Tuo Wang¹, Li Xiao¹

¹College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University, Wuhan 430072, China.

Journal of the American Chemical Society

|June 13, 2024

Resumen

Los investigadores desarrollaron un nuevo método para estudiar las interfaces electrodo/polielectrolito, que son cruciales para las tecnologías electroquímicas. El recubrimiento de electrodos con membranas de intercambio de aniones (AEM) permitió la catálisis de reducción de CO2, a diferencia de las superficies desnudas.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

Los polielectrolitos se usan cada vez más en dispositivos electroquímicos como pilas de combustible y electrolizadores, reemplazando a los electrolitos líquidos.
Las propiedades catalíticas de las interfaces electrodo/polielectrolito son poco conocidas debido a la falta de métodos de investigación eficaces.
La comprensión de estas interfaces es fundamental para el avance de las tecnologías electroquímicas.

Objetivo del estudio:

Desarrollar un método versátil para el estudio de las reacciones electrocatalíticas en las interfaces electrodo/polielectrolito.
Investigar la actividad catalítica de las interfaces electrodo/polielectrolito para la reacción de reducción de dióxido de carbono (CO2RR).
Para aclarar el papel de la estructura de la interfaz en la catálisis de CO2RR.

Principales métodos:

Una capa delgada de membrana de intercambio de aniones (AEM) fue recubierta en las superficies de los electrodos.
Esta configuración permitió el establecimiento de una interfaz de electrodo/polielectrolito puro en una célula electroquímica estándar.
Para el análisis interfacial se utilizó la espectroscopia de absorción infrarroja con reflexión total atenuada en la superficie (ATR-SEIRAS).

Principales resultados:

Las superficies de oro desnudo (Au) no mostraron actividad catalítica para el CO2RR sin cationes de metales alcalinos.
El recubrimiento del electrodo Au con un AEM activó significativamente el CO2RR.
ATR-SEIRAS indicó una red mejorada de enlaces de hidrógeno de agua en la interfaz Au/AEM, facilitando la CO2RR.

Conclusiones:

El método de recubrimiento AEM desarrollado proporciona un enfoque fiable para estudiar las interfaces electrodo/polielectrolito.
Los AEM pueden mejorar drásticamente la actividad catalítica de las superficies de los electrodos para el CO2RR.
Los hallazgos profundizan la comprensión fundamental de los fenómenos interfaciales en los sistemas electroquímicos basados en polielectrolitos.

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