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Borosilicidas de metal de transición covalente: vías de reacción en sales fundidas para la electrocatálisis de

Daniel Janisch¹, Fernando Igoa Saldaña¹, Edouard De Rolland Dalon¹

¹Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Sorbonne Université, CNRS, 4 place Jussieu, F-75005 Paris, France.

Journal of the American Chemical Society

|July 29, 2024

Resumen

Los investigadores desarrollaron un nuevo método de síntesis para los borosilicidas metálicos exóticos, descubriendo su potencial como electrocatalizadores de oxidación de agua eficientes y estables, particularmente Ni6Si2B.

Área de la Ciencia:

Ciencias de los materiales
Química inorgánica
La electroquímica

Sus antecedentes:

Los boruros y los silicidos metálicos exhiben propiedades vinculadas al enlace covalente.
Los borosilicidas metálicos presentan redes covalentes complejas y distribuciones de carga, que impactan en las propiedades.
Estos materiales son exóticos, difíciles de sintetizar y poco conocidos.

Objetivo del estudio:

Desarrollar una nueva vía de síntesis para los borosilicidas de metales de transición.
Investigar los mecanismos de formación y las propiedades de estos compuestos.
Para explorar su potencial como electrocatalizadores de oxidación de agua.

Principales métodos:

Síntesis de borosilicidas de metales de transición mediante una vía redox en sales fundidas.
Difracción de rayos X in situ para estudiar los mecanismos de formación.
Pruebas electrocatalíticas para la oxidación del agua, centradas en el Ni6Si2B.

Principales resultados:

Síntesis con éxito de Ni6Si2B, Co4.75Si2B, Fe5SiB2 y Mn5SiB2.
Se estableció un esquema general de formación impulsado por la covalencia de coordinación del boro.
Se ha demostrado una alta eficiencia electrocatalítica de oxidación del agua para el Ni6Si2B.
Factores identificados que contribuyen a la estabilidad y actividad de Ni6Si2B: redes entrelazadas, codoping y enriquecimiento de electrones metálicos.

Conclusiones:

Una nueva vía redox permite la síntesis de borosilicidas de metales de transición.
El Ni6Si2B muestra un rendimiento excepcional como electrocatalizador de oxidación de agua.
Este trabajo introduce los borosilicidas metálicos como una nueva clase prometedora de electrocatalizadores abundantes en la Tierra.

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