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Identificación in situ de sitios de zinc como interruptor de selectividad dependiente del potencial sobre

Qizheng An¹, Xupeng Qin¹, Xuan Sun¹

¹National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, P. R. China.

Journal of the American Chemical Society

|March 25, 2025

Resumen

Los investigadores desarrollaron un catalizador de doble átomo Co-Zn (DAC) para superar los desafíos en la producción de peróxido de hidrógeno (H2O2). Este catalizador controla con precisión la actividad y la selectividad, aumentando significativamente la eficiencia de la electrosíntesis de H2O2.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

La reacción de reducción de oxígeno electrocatalítico (ORR) para la producción de H2O2 se enfrenta a compensaciones de actividad y selectividad.
El desarrollo de catalizadores eficientes para las tecnologías de energía renovable es crucial.

Objetivo del estudio:

Diseñar un catalizador de doble átomo (DAC) que rompa de manera controlada la compensación actividad-selectividad en la electrosíntesis de H2O2.
Asignar sitios de un solo átomo independientes para la actividad (Co) y la selectividad (Zn) en el ORR.

Principales métodos:

Diseño y síntesis de un catalizador de doble átomo de Co-Zn (DAC).
Utilizando caracterizaciones multidimensionales in situ para estudiar el comportamiento del catalizador.
Realizar cálculos teóricos para comprender los mecanismos catalíticos.

Principales resultados:

El Co-Zn DAC logró una alta selectividad de H2O2 del 94,8%, una mejora significativa con respecto a los catalizadores de un solo átomo de Co.
Se observó una frecuencia de rotación de 2,7 s-1, lo que demuestra una actividad catalítica prominente.
Los sitios de Zn exhibieron una función de conmutación dependiente del potencial, lo que permitió la producción controlada de H2O2.

Conclusiones:

El DAC Co-Zn separa efectivamente las funciones de actividad y selectividad, lo que permite una eficiente electrosíntesis de H2O2.
Los sitios de Zn actúan como conmutadores universales en los DAC M-Zn (M = Pt, Ru, Ni), destacando su amplia aplicabilidad.
Las ideas sobre el comportamiento del sitio catalítico en tiempo real pueden guiar futuros diseños de catálisis energética.

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