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Un fotocatalizador de oxifluoruro estable y estrecho para la evolución del hidrógeno en la luz visible y la reducción
Ryo Kuriki1,2, Tom Ichibha3, Kenta Hongo4,5,6,7
1Department of Chemistry, School of Science , Tokyo Institute of Technology , 2-12-1-NE-2 Ookayama , Meguro-ku, Tokyo 152-8550 , Japan.
Journal of the American Chemical Society
|May 8, 2018
Resumen
Los investigadores desarrollaron un nuevo material de oxifluoruro, Pb2Ti2O5.4F1.2, que demuestra una excepcional fotocatálisis de luz visible para la evolución del hidrógeno y la reducción de CO2. Este avance desafía las suposiciones anteriores sobre los oxifluoruros en la fotocatálisis.
Área de la Ciencia:
- Ciencias de los materiales
- Fotocatálisis
- Química inorgánica
Sus antecedentes:
- Los compuestos aniónicos mixtos como los oxinitruros y los oxicalcogenuros son fotocatalizadores prometedores de luz visible debido a su potencial de banda de valencia.
- Anteriormente, los oxifluoruros se consideraban inadecuados debido a la alta electronegatividad del flúor.
Objetivo del estudio:
- Investigar el potencial de los pirocloroxifluoruros ordenados por aniones como fotocatalizadores de luz visible.
- Explorar la actividad fotocatalítica del Pb2Ti2O5.4F1.2 para la evolución del hidrógeno y la reducción del CO2.
Principales métodos:
- Síntesis y caracterización del pirocloro oxifluoruro ordenado por aniones Pb2Ti2O5.4F1.2.
- Modificación del material con promotores como nanopartículas de platino y un complejo de rutenio.
- Cálculos de la teoría funcional de la densidad (DFT) para comprender la estructura electrónica y la respuesta a la luz visible.
Principales resultados:
- Pb2Ti2O5.4F1.2 exhibe un pequeño espacio de banda (aprox. 2.4 eV) y funciona como un fotocatalizador de luz visible estable.
- El Pb2Ti2O5.4F1.2 modificado por el promotor impulsa eficientemente la evolución del H2 y la reducción del CO2.
- Los cálculos de DFT revelan una fuerte interacción orbital de Pb-6s y O-2p, atribuida a los enlaces cortos de Pb-O inducidos por la sustitución de flúor, lo que permite la absorción de luz visible.
Conclusiones:
- El pirocloro oxifluoruro ordenado por aniones Pb2Ti2O5.4F1.2 es un fotocatalizador excepcional impulsado por la luz visible.
- La sustitución de flúor en las redes de pirocloro puede crear nuevos materiales con propiedades fotocatalíticas mejoradas.
- Este trabajo abre nuevas vías para el diseño de fotocatalizadores de oxifluoruro avanzados.
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