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Elucidando la interfaz metálica electrificada por el ionómero.

Ian Kendrick1, Dunesh Kumari, Adam Yakaboski

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Los grupos funcionales de Nafion en las superficies de platino en las pilas de combustible causan cambios complejos de potencial en las vibraciones de CO adsorbidas. Este estudio revela que los grupos CF3 y SO3(-) se adsorben directamente en el platino, influyendo en el comportamiento del CO.

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Área de la Ciencia:

  • La electroquímica es electroquímica.
  • Ciencia de los materiales Ciencia de los materiales.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Los electrodos de pila de combustible operativos presentan interacciones complejas entre los ionómeros de Nafion y las superficies del catalizador de platino.
  • La adsorción de monóxido de carbono (CO) en el platino es crucial para la electrocatálisis de la pila de combustible, pero sus propiedades vibratorias son sensibles al entorno del electrodo.
  • Comprender el papel de los grupos funcionales de Nafion en la modificación de la adsorción de CO es clave para optimizar el rendimiento de la pila de combustible.

Objetivo del estudio:

  • Para dilucidar los grupos funcionales Nafion específicos responsables del ajuste Stark del CO adsorbido en el platino.
  • Para investigar los mecanismos de coadsorción de los componentes de Nafion en la interfaz platino-Nafion.
  • Para correlacionar los datos espectroscópicos experimentales con los cálculos teóricos para una comprensión completa.

Principales métodos:

  • La espectroscopia de infrarrojos (IR) operando y la espectroscopia de IR modulada por polarización (PM-IRRAS) se emplearon para estudiar la interfaz Pt-Nafion.
  • Se utilizó la espectroscopia IR de reflectancia total atenuada para el análisis de Nafion a granel.
  • Se realizaron cálculos de la teoría funcional de la densidad (DFT) para simular e interpretar espectros experimentales.

Principales resultados:

  • Los cálculos de DFT y los espectros experimentales indican que los grupos CF3, CF2 y SO3 ((-) de Nafion se adsorben en la superficie del platino.
  • Un modelo propuesto de la interfaz Nafion-Pt sugiere la adsorción directa de los grupos CF3 y SO3 ((-) en el platino.
  • Los cálculos de carga parcial de Mulliken apoyan la coadsorción de CF3, con una alta densidad de carga en los átomos de flúor CF3.

Conclusiones:

  • Los grupos funcionales de Nafion, en particular CF3 y SO3 ((-), se adsorben directamente en las superficies del catalizador de platino en las pilas de combustible en funcionamiento.
  • Esta coadsorción influye en el ordenamiento de la columna vertebral de Nafion y los grupos CF2 de la cadena lateral.
  • Los hallazgos proporcionan información crítica sobre la química de la interfaz que rige la electrocatálisis y el rendimiento de las pilas de combustible.