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Dependencia de bicarbonato para la hidrogenación de CO2 catalizado por Pd para formarse sobre un centro bimetálico

Xuyu Lv¹, Ting Luo¹, Chao Lv¹

¹Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, China.

Journal of the American Chemical Society

|November 4, 2025

Resumen

Este estudio revela cómo los electrolitos de bicarbonato regulan la electrohidrogenación de CO2 sobre los catalizadores de PdCu. El bicarbonato concentrado mejora la producción de formato suprimiendo el envenenamiento por CO y alterando las vías de reacción.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

El paladio (Pd) es eficaz para la reducción de CO2 para formar pero sufre envenenamiento por CO.
La comprensión de la cinética del envenenamiento por CO es crucial para mejorar la estabilidad y la eficiencia del catalizador.

Objetivo del estudio:

Investigar el papel de la concentración de electrolitos de bicarbonato en la mitigación del envenenamiento por CO en los catalizadores bimetálicos PdCu.
Para aclarar la influencia de la composición de electrolitos en la adsorción/absorción de hidrógeno y las vías de reacción para la electrohidrogenación de CO2.

Principales métodos:

Técnicas electroquímicas que incluyen la difracción de rayos X potenciodinámica, la espectroscopia de absorción de rayos X y la voltametría.
Cálculos teóricos que incluyen análisis de la estructura electrónica.
Espectroscopia infrarroja in situ y espectrometría de masas diferencial.

Principales resultados:

Los centros bimetálicos de PdCu, influenciados por la electronegatividad, debilitan la adsorción de CO y H.
La incorporación de cobre retrasa la perjudicial transición de fase de α-PdH a β-PdH.
Los electrolitos de bicarbonato concentrados promueven la adsorción de hidrógeno superficial y mantienen una alta cobertura de *OCHO, retrasando la formación de CO.

Conclusiones:

Los electrolitos de bicarbonato actúan como un regulador clave en la hidrogenación de CO2 catalizada por Pd para formar.
La interacción entre el electrolito, la composición del catalizador y la cobertura de hidrógeno dicta las vías de reacción (CH vs. PCET).
Este trabajo proporciona información para el diseño de electrocatalizadores estables y eficientes para la conversión de CO2.

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