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Mejorar la conducción de protones en los marcos de coordinación 2D de Co-La mediante la transición de fase de estado

Song-Song Bao1, Kazuya Otsubo, Jared M Taylor

  • 1State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, P. R. China.

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PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo material de fosfonato 2D 3d-4f (CoLa-II) pasa a una nueva fase (CoLa-III) por encima de 45°C y 93% de humedad relativa. Esta transición de fase mejora significativamente la conductividad de los protones en un orden de magnitud.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • La cristalografía es una técnica de cristalografía.

Sus antecedentes:

  • Los marcos metálico-orgánicos bidimensionales (2D) (MOF) se investigan activamente para aplicaciones energéticas.
  • La conductividad de los protones en los MOF es crucial para el desarrollo de membranas avanzadas de intercambio de protones.
  • Comprender las transiciones de fase en los MOF puede desbloquear nuevas funcionalidades.

Objetivo del estudio:

  • Para sintetizar y caracterizar un nuevo material de fosfonato 2D 3d-4f.
  • Para investigar el comportamiento de transición de fase del material sintetizado bajo diferentes temperaturas y humedades.
  • Para evaluar el impacto de la transición de fase en la conductividad de protones del material.

Principales métodos:

  • Difracción de rayos X monocristalino para la determinación estructural.
  • Análisis termogravimétrico (TGA) y calorimetría de barrido diferencial (DSC) para la estabilidad térmica.
  • Difracción de rayos X en polvo de temperatura variable y humedad variable (PXRD).
  • Espectroscopia de impedancia electroquímica (EIS) para mediciones de conductividad de protones.

Principales resultados:

  • Se sintetizó con éxito un nuevo fosfonato 2D 3d-4f, [Co(III) La(III) ((nopH) ((H2O)) 6ClO4·5H2O (CoLa-II).
  • El CoLa-II sufre una transición de fase reversible a [H3O][CoLa(notp) ((H2O) ]ClO4·3H2O (CoLa-III) por encima de 45 °C y un 93% de humedad relativa.
  • La transición de fase implica la migración de protones de la capa interna a la capa intermedia, lo que lleva a un aumento de un orden de magnitud en la conductividad de los protones.

Conclusiones:

  • El fosfonato 2D 3d-4f sintetizado exhibe una transición de fase dependiente de la humedad y la temperatura.
  • Esta transición facilita la mejora de las vías de transporte de protones dentro del material.
  • El material muestra potencial para aplicaciones en dispositivos y membranas conductores de protones.