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Formación y difusión de adsorbados subterráneos en los electrodos

Björn Rahn1, Olaf M Magnussen1

  • 1Institute of Experimental and Applied Physics , Kiel University , Olshausenstrasse 40 , 24098 Kiel , Germany.

Journal of the American Chemical Society
|July 10, 2018
PubMed
Resumen

Los investigadores observaron que una especie subterránea se formaba en los electrodos metálicos y migraba dentro de la capa superficial. Este descubrimiento, utilizando microscopía de túnel de barrido, revela una difusión superficial mejorada a través de vías mediadas por vacío, que potencialmente impactan la electrocatálisis.

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Área de la Ciencia:

  • Ciencias de la superficie
  • La electroquímica
  • Ciencias de los materiales

Sus antecedentes:

  • La comprensión de los procesos interfaciales en los electrodos metálicos es crucial para la electrocatálisis.
  • La dinámica de las especies dentro de la capa superficial de los electrodos no se entiende completamente.
  • Las capas electroquímicas dobles influyen en las reacciones superficiales.

Objetivo del estudio:

  • Observar directamente la formación y la migración de las especies subterráneas en electrodos metálicos.
  • Investigar el papel de las vacantes superficiales en la difusión de especies.
  • Explorar las implicaciones de la dinámica superficial mejorada para las reacciones electrocatalíticas.

Principales métodos:

  • Microscopía de túnel de barrido con velocidad de vídeo in situ (STM).
  • Se estudió el sulfuro adsorbido en electrodos Ag ((100) cubiertos de bromuro en electrolitos líquidos.
  • Se analizaron las transiciones reversibles entre los sitios de adsorción superficiales y las vacantes subterráneas.

Principales resultados:

  • Observación directa de la formación y migración de una especie subterránea por debajo de la doble capa electroquímica.
  • Se han identificado transiciones reversibles de sulfuro adsorbido entre las zonas superficiales y las vacantes de Ag de la primera capa.
  • Orden de magnitud observada en la difusión superficial del sulfuro atribuida a las vías mediadas por la vacante.

Conclusiones:

  • La formación y migración de especies subterráneas son procesos dinámicos que ocurren en las superficies de los electrodos metálicos.
  • La difusión mediada por la vacante mejora significativamente la movilidad de las especies de superficie.
  • Estos hallazgos sugieren nuevas vías para las reacciones electrocatalíticas y los procesos de crecimiento del material.