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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Mejora de la electrorreducción de CO2 con la interfaz de óxido de metal

Dunfeng Gao¹, Yi Zhang^1,2, Zhiwen Zhou^1,2

¹State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, iChEM, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.

Journal of the American Chemical Society

|April 11, 2017

Resumen

La construcción de interfaces de óxido de metal, como Au-CeO, aumenta significativamente la eficiencia de la reducción electroquímica de dióxido de carbono (CO2). Esta estrategia mejora la adsorción y activación de CO2, ofreciendo una vía prometedora para la conversión de CO2.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

La reacción de reducción electroquímica del CO2 (RR) es crucial para convertir el CO2 en productos valiosos.
Los catalizadores RR de CO2 actuales, principalmente los metales de transición, se enfrentan a desafíos en cuanto a eficiencia y selectividad.
Las estrategias para mejorar la RR de CO2 implican la modificación del catalizador y la optimización del electrolito.

Objetivo del estudio:

Investigar la mejora de la RR de CO2 mediante la construcción de interfaces de óxido de metal.
Para explorar la actividad catalítica y la eficiencia Faradaic de Au-CeO para CO2 RR.
Demostrar la generalidad de la estrategia de interfaz para la mejora de la RR.

Principales métodos:

Fabricación y caracterización de las interfaces Au-CeO_x y Ag-CeO_x.
Microscopía de túnel de barrido in situ (STM) y espectroscopía de fotoemisión por radiación de sincrotrón (SRPES) para el análisis de la interfaz.
Cálculos de la teoría funcional de la densidad (DFT) para aclarar los mecanismos de reacción.

Principales resultados:

Au-CeO_x exhibe una actividad significativamente mayor y una eficiencia Faradaic para CO₂RR en comparación con Au o CeO_x individuales.
La interfaz Au-CeO_x mejora la adsorción y activación de CO₂, promovida aún más por los grupos hidroxilo.
Ag-CeO_x también demuestra CO₂RR mejorado por la interfaz, lo que confirma la amplia aplicabilidad de la estrategia.

Conclusiones:

La interfaz metal-óxido es una estrategia muy eficaz para aumentar el rendimiento de la RR de CO2.
La sinergia entre Au y CeO_x en la interfaz facilita la activación de CO₂ y estabiliza el intermediario clave *COOH.
Este enfoque de ingeniería de interfaz ofrece una ruta prometedora para el desarrollo de electrocatalizadores eficientes para la conversión de CO2.

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