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Transporte selectivo de protones dependiente de la presión del vapor en un marco metálico-orgánico con dos poros
Sarah S Park1, Adam J Rieth1, Christopher H Hendon1
1Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|February 3, 2018
Resumen
Los investigadores estudiaron la conductividad de los protones en un marco metálico-orgánico, el MIT-25, revelando dos vías de transporte distintas. Este hallazgo avanza en la comprensión de la conducción de protones en materiales porosos.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La física
Sus antecedentes:
- La conductividad de protones en sólidos porosos es crucial para aplicaciones energéticas.
- Comprender la relación entre la estructura de los poros y los mecanismos de transporte de protones (Grotthuss vs. vehicular) es un desafío debido a la naturaleza amorfa de muchos conductores.
- Las estructuras metálicas orgánicas (MOF) ofrecen estructuras porosas ajustables para investigar estos fenómenos.
Objetivo del estudio:
- Para elucidar sistemáticamente distintas vías de transporte de protones en el marco metal-orgánico mesoporoso MIT-25.
- Para correlacionar las estructuras específicas de los poros y la dinámica de llenado con los mecanismos de conductividad de protones.
- Para diferenciar el comportamiento de transporte de protones en canales paralelos de diferentes tamaños.
Principales métodos:
- Se utilizaron mediciones de conductividad de protones dependientes de la temperatura y la humedad.
- Utilizó cálculos de la teoría funcional de la densidad (DFT) para obtener información teórica.
- Presión de vapor controlada para llenar secuencialmente poros de diferentes tamaños (∼27 Å y ∼4,5 Å).
Principales resultados:
- Identificó dos vías distintas de transporte de protones dentro de los canales paralelos del MIT-25.
- Se observaron diferentes energías de activación para la conductividad de protones a baja y alta humedad relativa, correspondientes al llenado secuencial de poros.
- Se demostró la influencia del tamaño de los poros y el nivel de hidratación en los mecanismos de transporte de protones.
Conclusiones:
- El MIT-25 exhibe distintos mecanismos de conducción de protones dependientes del llenado de poros y la humedad relativa.
- El estudio proporciona un enfoque sistemático para comprender las relaciones estructura-función en los conductores porosos de protones.
- Los hallazgos contribuyen al diseño racional de materiales avanzados para aplicaciones conductoras de protones.
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