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El almacenamiento de hidrógeno en los análogos azules prusianos deshidratados M3[Co(CN) [6]2 (M = Mn, Fe, Co, Ni, Cu,
Steven S Kaye1, Jeffrey R Long
1Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA.
Journal of the American Chemical Society
|May 5, 2005
Resumen
Los análogos azules prusianos exhiben grandes superficies y importantes capacidades de almacenamiento de hidrógeno. Estos materiales demuestran un potencial prometedor para aplicaciones eficientes de adsorción y almacenamiento de hidrógeno.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química Química es la química.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los análogos del azul prusiano son compuestos de coordinación con estructuras sintonizables.
- Los materiales eficientes de almacenamiento de hidrógeno son cruciales para las tecnologías de energía limpia.
- Comprender las propiedades de porosidad y adsorción es clave para el diseño de materiales.
Objetivo del estudio:
- Para investigar las propiedades de porosidad y almacenamiento de hidrógeno de los análogos azules de Prusia deshidratados M3[Co(CN) [6]2.2.
- Evaluar el potencial de estos materiales para la adsorción de hidrógeno a temperaturas criogénicas.
- Para determinar la relación entre la composición del material y la absorción de hidrógeno.
Principales métodos:
- Síntesis de seis análogos azules prusianos: M3 [Co(CN) 6] 2 (M = Mn, Fe, Co, Ni, Cu, Zn).
- Isotermas de sorción de argón a 87 K para determinar las superficies de BET.
- Isotermas de sorción de hidrógeno a 77 K y 890 Torr para medir la capacidad de almacenamiento.
- Ajuste de la ecuación de Langmuir-Freundlich para la predicción de la absorción máxima.
- Cálculo de las entalpías de adsorción de isotermas de hidrógeno a 77 y 87 K.
Principales resultados:
- Las superficies de BET oscilaron entre 560 m2/g (Ni) y 870 m2/g (Mn), con Mn3 [Co(CN) 6] 2 comparable a las zeolitas.
- Se observó una absorción significativa de hidrógeno, con capacidades de hasta 1,8 wt % y 0,025 kg H2/L (Cu).
- Las capacidades de saturación pronosticadas alcanzaron el 2,1% en peso y 0,029 kg H2/L para Cu3[Co(CN) [6]2.
- Las entalpias de adsorción aumentaron con M en el orden Mn < Zn < Fe < Co < Cu < Ni, en un rango de 5.3-7.4 kJ/mol.
Conclusiones:
- Los análogos deshidratados del azul prusiano poseen grandes superficies y considerables capacidades de almacenamiento de hidrógeno.
- Los materiales estudiados muestran entalpias de unión superiores en comparación con los marcos metálicos orgánicos de referencia.
- Estos hallazgos destacan los análogos azules prusianos como candidatos prometedores para soluciones avanzadas de almacenamiento de hidrógeno.
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