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Caminos para la Transferencia de Electrones en las Interfaces MgO-Agua desde la Dinámica Molecular
Zhutian Ding1, Zachary K Goldsmith1, Annabella Selloni1
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.
Journal of the American Chemical Society
|January 21, 2022
Resumen
Un exceso de electrones en la interfaz MgO-agua se localiza en un estado de defecto intermedio. La transferencia de electrones forma principalmente un electrón localizado en la superficie, no un radical de hidrógeno, lo que explica el MgO
Área de la Ciencia:
- Ciencias de la superficie
- Química computacional
- Ciencias de los materiales
Sus antecedentes:
- La transferencia de electrones en las interfaces óxido-agua es crucial para la catálisis y la radiólisis.
- El óxido de magnesio (MgO) es un óxido de banda ancha con aplicaciones potenciales.
Objetivo del estudio:
- Investigar la dinámica de transferencia de electrones en la interfaz MgO-agua.
- Caracterizar la localización de electrones interfaciales y las vías de reacción.
Principales métodos:
- Simulaciones de dinámica molecular inicial utilizando la teoría funcional de la densidad híbrida.
- El análisis se basa en la teoría de Marcus.
Principales resultados:
- Los electrones en exceso en MgO se localizan en estados de defecto intermedio, similares a los electrones hidratados.
- Se observaron dos productos de transferencia de electrones: electrón localizado en la superficie (esurf-) y radical de hidrógeno acuoso (H•).
- esurf es el producto cinético debido a una barrera de activación más baja.
Conclusiones:
- El producto cinético esurf- explica la utilidad limitada de MgO en la radiólisis del agua.
- El marco computacional es aplicable a otras interfaces fotocatalíticas acuosas.
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