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Fabrication of Ti3C2 MXene Microelectrode Arrays for In Vivo Neural Recording
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¿Se pueden insertar aniones en MXene?

Netanel Shpigel1, Arup Chakraborty1, Fyodor Malchik2

  • 1Department of Chemistry and BINA-BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.

Journal of the American Chemical Society
|August 6, 2021
PubMed
Resumen
Este resumen es generado por máquina.

La intercalación de aniones en electrodos Ti3C2Tx (MXene) es poco probable, incluso en electrolitos concentrados. Este hallazgo aclara el comportamiento de MXene en el almacenamiento de energía, a pesar de su potencial para aplicaciones de alta potencia.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Almacenamiento de energía

Sus antecedentes:

  • Ti3C2Tx (MXene) es prometedor para baterías de alta potencia y supercondensadores.
  • El papel de los aniones y su intercalación en los electrodos MXene sigue sin estar claro.
  • La estabilidad potencial positiva limitada en electrolitos diluidos dificulta el rendimiento de MXene.

Objetivo del estudio:

  • Investigar la posibilidad de intercalación de aniones en los electrodos MXene.
  • Aclarar el papel de los aniones en el almacenamiento de energía electroquímica utilizando MXene.
  • Determinar si la inserción de aniones se produce dentro del rango de potencial operativo para el almacenamiento de energía capacitiva.

Principales métodos:

  • Microbalance de cristal de cuarzo electroquímico gravimétrico in situ con mediciones de control de la disipación (EQCM-D).
  • Experimentos realizados con electrolitos LiCl y LiBr altamente concentrados para ampliar el rango de potencial positivo.
  • Cálculos de la teoría funcional de la densidad complementaria (DFT).

Principales resultados:

  • Las variaciones de cambio de masa indican que no hay inserción significativa de aniones en los electrodos MXene.
  • No se observó intercalación aniónica ni siquiera en electrolitos concentrados y en rangos potenciales extendidos.
  • Los cálculos de la teoría funcional de la densidad apoyan los hallazgos experimentales.

Conclusiones:

  • Es poco probable que las especies aniónicas se intercalen en Ti3C2Tx (MXeno) dentro de los potenciales relevantes para el almacenamiento de energía capacitiva.
  • La fuerte carga negativa en las láminas de MXene, debido a los grupos funcionales, impide la inserción de aniones.
  • Este hallazgo proporciona información crucial sobre el comportamiento del electrodo MXene y las limitaciones en las aplicaciones de almacenamiento de energía.