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Membranas de intercambio de aniones alcalinos enlazadas de alto rendimiento sintonizables para aplicaciones de celdas
Nicholas J Robertson1, Henry A Kostalik, Timothy J Clark
1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA.
Journal of the American Chemical Society
|February 25, 2010
Resumen
Se sintetizaron nuevas membranas de intercambio de aniones alcalinos (AAEM) entrelazadas mediante la polimerización de la metátesis de apertura de anillos. Estas membranas muestran una alta conductividad de hidróxido y buenas propiedades mecánicas, avanzando en la tecnología de celdas de combustible.
Área de la Ciencia:
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- La electroquímica es electroquímica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Las pilas de combustible ofrecen una conversión de energía prometedora, pero requieren componentes mejorados para la viabilidad comercial.
- Las membranas de electrolito de polímero son críticas para el rendimiento de la pila de combustible, separando los electrodos.
- Si bien se han establecido membranas conductoras de protones, las membranas conductoras de hidróxido (membranas de intercambio aniónico alcalino, AAEM) son menos exploradas.
Objetivo del estudio:
- Desarrollar nuevos materiales de membrana reticulados para las membranas de intercambio de aniones alcalinos (AAEM).
- Para mejorar la conductividad de iones de hidróxido y las propiedades mecánicas para aplicaciones de celdas de combustible.
- Explorar enfoques sintéticos fáciles para los AAEM avanzados.
Principales métodos:
- Se utilizó la polimerización por metátesis de apertura de anillo (ROMP) para sintetizar materiales poliméricos reticulados.
- Investigó la incorporación de iones y la conductividad de las membranas sintetizadas.
- Evaluó las propiedades mecánicas de las membranas reticuladas resultantes.
Principales resultados:
- Generó con éxito nuevos materiales de membrana reticulados a través de ROMP.
- Se logró una alta conductividad de iones de hidróxido en los AAEMs desarrollados.
- Demostrado buenas propiedades mecánicas adecuadas para el funcionamiento de pilas de combustible.
Conclusiones:
- El enlace cruzado mejora la incorporación de iones, lo que lleva a altas conductividades en los AAEM.
- El fácil enfoque sintético produce materiales con potencial para celdas de combustible de hidrógeno y metanol directo.
- Los AAEM desarrollados podrían avanzar significativamente en las tecnologías de celdas de combustible al permitir una operación alcalina eficiente.
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