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Catalizadores de celdas de combustible de cobalto y platino de carga ultrabaja derivados de estructuras de

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Los investigadores desarrollaron nuevos electrocatalizadores utilizando precursores basados en platino y cobalto ultrabajos. Estos catalizadores muestran una alta actividad y estabilidad para la reacción de reducción de oxígeno (ORR) en las pilas de combustible, crucial para la reducción de costes.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Catálisis

Sus antecedentes:

  • La reducción del contenido de platino es clave para reducir los costos de las pilas de combustible.
  • El desarrollo de electrocatalizadores altamente activos y estables es esencial para el funcionamiento eficiente de las pilas de combustible.

Objetivo del estudio:

  • Para crear nuevos electrocatalizadores con carga de platino ultrabaja para mejorar el rendimiento de la pila de combustible.
  • Investigar los efectos sinérgicos de las nanopartículas de platino-cobalto y sustratos libres de PGM.

Principales métodos:

  • Utilizó estructuras de imidazolato zeolítico cobalto o cobalto-zinco bimetálico como precursores.
  • Las nanopartículas de núcleo de platino-cobalto preparadas sobre un sustrato libre de PGM.
  • Empleó el modelado computacional para comprender los mecanismos catalíticos.

Principales resultados:

  • Se obtienen altas actividades de masa de reacción de reducción de oxígeno (ORR, por sus siglas en inglés) (1,08 y 1,77 A mgPt-1).
  • Se ha demostrado un excelente rendimiento de las pilas de combustible bajo O2 o aire a alta tensión y corriente.
  • Los catalizadores conservaron el 64% y el 15% de la actividad inicial después de 30.000 ciclos de voltaje.

Conclusiones:

  • La catálisis sinérgica entre las nanopartículas de Pt-Co y los sitios libres de PGM mejora la actividad y la durabilidad de ORR.
  • Este enfoque ofrece una estrategia prometedora para los electrocatalizadores de pila de combustible rentables.