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Estudios de RMN en tiempo real de condensadores electroquímicos de doble capa en tiempo real

Hao Wang¹, Thomas K-J Köster, Nicole M Trease

¹Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.

Journal of the American Chemical Society

|November 3, 2011

Resumen

La espectroscopia de RMN de boro-11 reveló sitios de unión distintos para los aniones de tetrafluoroborato (BF4-) en el carbono poroso. La RMN in situ observó la migración iónica en tiempo real y los cambios de unión en los supercondensadores.

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 supercondensadores almacenan energía utilizando condensadores electroquímicos de doble capa.
Comprender la absorción de iones en los materiales de los electrodos es crucial para el rendimiento de los supercondensadores.
Los carbones porosos con grandes superficies son materiales prometedores para los electrodos.

Objetivo del estudio:

Para investigar el comportamiento de sorción de los aniones de tetrafluoroborato (BF4-) en el carbono poroso utilizando la espectroscopia de RMN.
Para identificar diferentes sitios de unión para los aniones BF4 en la superficie del carbono.
Para monitorear la migración de iones y los cambios de unión in situ durante el funcionamiento del supercondensador.

Principales métodos:

(11) B Espectroscopia de Resonancia Magnética Nuclear (11B NMR). espectroscopia de resonancia magnética nuclear (11B NMR). espectroscopía de resonancia magnética nuclear (11B NMR). espectroscopía de resonancia magnética nuclear (11B NMR). espectroscopía de resonancia magnética nuclear (11B NMR).
Mediciones de RMN in situ durante el ciclo electroquímico.
Estudios de sorción en materiales de carbono altamente porosos y de gran superficie.

Principales resultados:

Identificación de sitios de unión distintos para los aniones BF4 en la superficie del carbono.
Observación de la migración en tiempo real de aniones BF4- entre las superficies de los electrodos.
Detección de cambios dinámicos en la naturaleza de la unión iónica a la superficie de carbono durante el funcionamiento.

Conclusiones:

(11) La espectroscopia de RMN B es eficaz para elucidar los mecanismos de sorción de aniones en los supercondensadores.
El estudio proporciona información sobre el comportamiento dinámico de los aniones BF4- dentro de los electrodos de carbono porosos.
Comprender estas dinámicas puede guiar el diseño de materiales de supercondensadores mejorados y electrolitos.

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