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Conducción de protones en un marco orgánico metálico basado en fosfonatos mediado por una "difusión libre" intrínseca
Simona Pili1, Stephen P Argent2, Christopher G Morris2,3
1School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, U.K.
Journal of the American Chemical Society
|May 17, 2016
Resumen
La conductividad de los protones en las estructuras metal-orgánicas (MOF) MFM-500 (Ni) es impulsada por la difusión libre. La dispersión de neutrones casi elástica revela este mecanismo único de transporte de protones en las MOF.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La física
Sus antecedentes:
- Los mecanismos de conducción de protones en los materiales son vitales para el desarrollo de soluciones avanzadas de conductividad.
- Las estructuras metal-orgánicas (MOF) ofrecen estructuras ajustables para aplicaciones potenciales de transporte de protones.
Objetivo del estudio:
- Para aclarar el mecanismo molecular de difusión de protones en un nuevo MOF basado en fosfonato, MFM-500 ((Ni).
- Para investigar la conductividad de protones de MFM-500 (Ni) bajo condiciones de alta humedad.
Principales métodos:
- Se empleó la dispersión de neutrones casi elástica (QENS) para estudiar la dinámica de los protones.
- Las mediciones de conductividad de protones se realizaron a un 98% de humedad relativa y a 25 °C.
Principales resultados:
- Los datos de QENS indicaron que la difusión de protones en MFM-500 (Ni) ocurre a través de la "difusión libre intrínseca dentro de una esfera".
- MFM-500 ((Ni) exhibió una conductividad de protones de 4,5 × 10−4 S/cm.
Conclusiones:
- El estudio identifica un nuevo mecanismo de difusión de protones en los MOF.
- MFM-500 ((Ni) demuestra una conductividad de protones significativa mediada por este mecanismo único, destacando su potencial para materiales conductores de protones.
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