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Catalizadores de un solo átomo de metal altamente activos y estables logrados por fuertes interacciones electrónicas

Junjie Li^1,2, Qiaoqiao Guan^1,2, Hong Wu³

¹Hefei National Laboratory for Physical Sciences at the Microscale , University of Science and Technology of China , Hefei , Anhui 230026 China.

Journal of the American Chemical Society

|September 3, 2019

Resumen

El diseño de catalizadores estables de un solo átomo (SAC) es difícil. Este estudio muestra que las interacciones electrónicas de soporte metálico (EMSI) en Pt1/Co3O4 aumentan la actividad y la estabilidad para la generación de hidrógeno a partir del borano de amoníaco.

Área de la Ciencia:

Ciencias de los materiales
Catálisis
Nanotecnología

Sus antecedentes:

El desarrollo de catalizadores activos y estables de un solo átomo (SAC) es un desafío debido a la alta energía libre superficial de los átomos metálicos.
Los catalizadores de un solo átomo y nanopartículas de platino existentes a menudo sufren desactivación a través de la sinterización y la lixiviación.

Objetivo del estudio:

Diseñar catalizadores monoatómicos (SAC) altamente activos y estables para la deshidrogenación del amoniaco borano.
Investigar el papel de las interacciones electrónicas de soporte metálico (EMSI) en la mejora del rendimiento del catalizador.

Principales métodos:

Átomos de platino sintetizados en el soporte de óxido de cobalto (Pt1/Co3O4).
Se utilizaron fuertes interacciones electrónicas con soporte metálico (EMSI) para adaptar las propiedades electrónicas de Pt1.
Se empleó la caracterización espectroscópica y los cálculos teóricos para comprender el mecanismo catalítico.

Principales resultados:

Pt1/Co3O4 exhibió un aumento de 68 veces en la actividad para la deshidrogenación del amoniaco borano en comparación con otros soportes.
El catalizador demostró una excelente estabilidad frente a la sinterización y la lixiviación.
Se encontró que los ISME modulan la adsorción de amoniaco borano y facilitan la desorción de hidrógeno.

Conclusiones:

La adaptación del estado 5d de átomos individuales Pt1 a través de EMSI es una estrategia prometedora para el diseño de SAC altamente activos y estables.
Este enfoque ofrece una nueva vía para el desarrollo de catalizadores avanzados para la generación de hidrógeno y otras reacciones.

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